Eames Lounge Chair "I WANT ONE"  

I'm no expert, but I'd say it depends on the price
I used to have one of those Plycraft ones, I liked it, it was comfortable. Although, there was always this nagging feeling I had that it wasn't the *real* deal - I eventually gave it away and now wish that I hadn't.
What are they asking for it? And what city do you live in (just kidding)

four Plycrafts here
I've reupholstered four Plycraft chair sets here (sold one, kept one, gave two to my grown kids). I used to long for the real thing but heard from several people that they find the Plycrafts to be more comfortable. I like how they tilt and the Eames chair doesn't tilt, so I've decided to stick with my Plycraft and put my money into things that matter more.
They do look really good when redone in a good quality cowhide. Makes a huge difference.
I also upgraded the armrests on the one that I kept. Usually the leather is just wrapped around to the underside and stapled but I redid them with boxed welted covers like on the Eames chairs. It just gives them more of a quality look. The wrapped leather looks cheap to me.

Here's one
scheduled for auction on the 23rd - via Wright/ebay Live auction
http://cgi.liveauctions.ebay.com/ws/eBayISAPI.dll?ViewItem&category=2821...

I own
I own a Plycraft lounge chair which IS very comfortable. But my office has a real-deal Eames Lounge (I always steal it during staff meetings). They are incomparable. The Eames is better by miles. The Plycraft tilts (and squeaks and groans) but during exteded sittings the chair puts pressure on my legs. On the Eames the fixed recline doesnt push you forward.
If it were a choice between the two I wouldnt hesitate for a second to get the real Eames.

So......
What you're saying is it's all about preference. I've sat in the eames lounge and it was very comfortable. I'm 5ft tall (or short,lol) and proportions are important for my comfort. But I can't actually sit in a plycraft right? They're not being made anymore.

apples to oranges
Comparing the Plycraft & the Eames is like comparing a Ford Focus to a BMW 3 series. Both will drive you places, have four doors, and wheels...but thats about where the similarities end.
The Plycraft is good, but it will always be an imitator. If you can afford the real thing I say its worth it. You also wont have to deal with any issues of the chair already being 30 years old - which you will with Plycraft.

differences
The difference that I was told matters in regards to comfort is one of proportions. Some people fit the Plycraft better than the Eames. That aside, certainly the Eames chair has got to be superior.
I sat in one in Harrod's for awhile and it was very nice but it's usually not a good idea to judge the comfort of a chair when you've been sight-seeing and shopping all morning. A pillow on top of a pile of bricks would feel pretty good on a day like that. I'd love to have an Eames chair and a Plycraft in my house for a few days just to compare. That'd be fun.

i own all three of the ...
i own all three of the chairs the Herman miller
Plycraft and Selig, the last two being almost the same other than arms on the plycraft, It truly is the most comfortable, but the Herman miller is Iconic end of discussion, nothing can compare it is the the top of the Heap, and when you own that chair it is a piece of history,art, and owning a world class piece of furniture, nothing else can compare.
Truly at the end of the day you really dont care that much how good it is to sit in it , just worth owning one to look at. especially if you have a rosewood from the 1970s and 80s the best years they made the chair with the wonderful rosewood.

As usual, Lloyd
you're right on the money.
No one should ever buy a copy if they can't get an original (other than Nelson clocks, of course)!

A little welcome variety...
As iconic as the Eames chair is, unfortunately it has almost become a tired cliche today. It definitely suffers from overexposure in my opinion. I actually enjoy seeing the variations of the plycraft lounge chairs- some with the plywood bent like wings, and some have bent plywood details on the bases- pretty cool.

Yes, but
Yes, but those chairs are more designed unto themselves, rather than being copied of the Eames. Mulhauser, especially was a very gifted designer.

I agree. I have the Eames 670...
I agree. I have the Eames 670 and I still want a Mulhauser. I have always liked his lounge chairs on their own right.

i've got..
PasternakAntiques.blogspot.com
at the moment i have 2 tan eames lounges, an ivory 50th anniversary eames lounge and about a dozen plycraft and selig eames style lounges in stock.
for the price, plycraft and selig chairs are great and the quality is very good. if price is not an issue i'd go with the real deal (these are 5-10 times more expensive than the plycraft and selig chairs).
both are a good investment.

I just got mine!
I love you, ebay. I love you, "Buy It Now". I love you, Charles Eames. It's ivory and walnut, practically new, (2001) and soooo beautiful. $2499 USD, near mint condition, slight creasing and wear to the leather, which is a good thing.
Lawd, I'm exhausted. I know, I know, you are all saying, "Wait a second. Isn't this the chick who wouldn't pay 3 or 4 grand for a chair, ever, under any circumstances?"
I confess, I have been secretly coveting one for months now and I made that statement in the earliest days of my obsession. I take it all back. Some chairs are just worth that much money. Plus, I have been looking at the Vitra ones over in Switzerland and they are, like, 5000 Euros. So, mine is a bargain, right?
Here is a picture of my new chair and ottoman and if anyone says anything bad, I swear, I will slit my wrists.