I have two pairs of the Samsung SSG-5100GB, and one pair of the Panasonic TY-ER3D4MU glasses. I've not tried the JVCs because they are crazy expensive.
My local Fry's sells the Samsung's for $15 per pair, which is crazy cheap, and I'm tempted to pick up a couple more pairs at that price!CNET did a review on compatible glasses a few months back
, which made me interested to try the Panasonics, as they said them were the best of the bunch at that point.
To be honest though, I wish I hadn't... I find the Panasonics to be slightly inferior to the Samsungs. The Samsung glasses feel sort of flimsy, and as stated by fiercegt, they don't cover your whole field of view. The Panasonic glasses are heavier, re-chargable, and though the lenses are no bigger, the frame blocks some of the light from your peripheral vision.
I tend to keep both glasses with me, and swap between the two... The Samsungs have a slightly uncomfortable bridge that starts to hurt my nose after a hour or so, and the Panasonics are a bit too heavy for my liking. I'm not sure if it's me, but I also think the Panasonics might flicker a tiny bit more than the Samsungs.
The Panasonics do have a neat feature that I've not seen elsewhere, and that is a switch to go into a 2D mode.
Overall, I like watching a movie in 3D, but I do find wearing glasses and the flicker of active lenses annoying. I wish I could afford a passive system, because that would obviously be oh-so-much better!