I was very curious to see so few posts on the Kermit posers.  I got mine last week - am I the only other person who actually has his in his possession?
They are, for the price, quite good.  The armature is excellent - better than the real Henson posers, in fact.  The fleece is a very close match to the original, but it is softer and fluffier.  I suspect that with use, it will pill fairly quickly.  The color is perfect, though.  Yes, it IS smaller than the real puppet, but not too much.  The head seems a bit under-stuffed, but this may also be due to the fact that the real Kermit fleece is more robust, and probably holds its shape a bit better.  The collar is odd - the points are cut a but thin, with a curve to them - the real deal has straight lines, making the points wider.  The curved lines of the black flocked "pupils" seem a bit long - in fact, the pupils are a bit over-scale for the whites in general.  And the eyes are a bit too close together - a common Kermit reproduction failing, even with the licensed toys.  It makes him look a bit wall-eyed.  Without a doubt, the most outstanding feature of this item is the stitching.  The seams are nearly non-existant - I can't imagine how they did this with machine stitching!  And the details of the hands, feet, and mouth edge - which appears hand glued (!) - are terrific.  I defy anyone to make anything this close to the real deal for this price.  A worthwhile investment for true Muppet fans.
PS - The Gonzo prototype does, indeed, look AMAZING, but I can't imagine that the exposed foam I see on it won't yellow and degrade incredibly quickly.  It's one of the reasons Muppets have to be re-made so often - foam does not last long, especially when it's not covered and exposed to natural light.  I see this as a major design problem.