Suffice to say I'm loving it
Once I get a game running sweetly enough I'm having trouble putting it down again (even if it's an old one I've played end-to-end multiple times already).
Criticisms of the technology when it comes to ghosting and so forth, are well founded, but not really something we should blame any single hardware vendor for, they do all tend to do it to varying degrees and the games can contribute to it or not as well.
Input lag - well I'm no twitch expert and haven't done that type of play since the original glquake multiplayer days, and I'm only coming from a slowish monitor (I suspect) to this one so don't have much to judge by. I will just say that I if there is such a thing as input lag I do not relate to it. Anything I do with mouse inputs @ 120Hz just responds instantly.
Bottom line: is it awesome? Hell yes! Is it perfect? Not even close, but my only gripes really are levelled at the tech in general and the fact 99.9% of games didn't even consider stereo3d when they were designed (and even those that were like crysis 2 get a luke warm reception from stereo3d ratings).
It's a bit of a trick finding settings that work well in games, you have to experiment not only with the game settings in ways you wouldn't normally have to (for instance, I thought I was getting massive ghosting in Everquest but just turned out to be weird lighting effects with the advanced lighting model - turned that off and the experience was good).
Not all games allow you to turn off the broken artifacting effects either, like shadows in Mirror's Edge for example on people are cruddy and glitchy, so you have to figure out which artifacts you can and can't live with. In the case of that one, you rarely interact with other characters anyway and when you do it's a brief confrontation that lasts for seconds, so that was a live with it one.
In Dead Space I could turn the glitches off but they didn't really bother me much and the awesomeness of the game in stereo3d far outweighed the price of the glitches (glowing light effects and shadows, mainly at distance) that I still would rather play it that way.
Not sure yet why my own direct3d apps aren't rendering in stereo3d (windowed mode), I'm going to have to look into that. Oh and the only film I have is Tron which I played in 3D using a trial install of TMT which was pretty sweet too

Though it looks like most of the 3d gimmick labelling that goes on should be levelled at movies that aren't really 3d and just done in post-processing because they do look crap, like animated pop-up books where the parallax layers are stupidly obvious. When the films are properly done it's a lot better, and as I've said in another post, I never want to play a 'plain' 3d game ever again now I know what this is capable of.
Oh yeah.. and the battery life of the glasses are particularly noteworthy. Having gotten plenty of rechargable devices my expectations like with most of those is you'd get a few days of standby time or somewhere around half a day of sustained use, and you'd need to recharge again.
With these glasses (which as I understand have been improved, they didn't used to have such good life,) I charged them one time for 3 hours when I opened the box, and I must have used them for 5-12 hours every day in the past week and still there's no sign of the battery even getting low. A small thing but a pleasant surprise nonetheless.