i have the gs300 and i kind of have mixed feelings about it. First off, and most prominently, its good bang for your buck. It's quite cheap for the image quality it gets, i've been able to get some really nice looking shots out of it. Biiig downside is manual controls, sure they got some, but they're so hard to access, that you basically cant use them. The lack of a focus ring hurts it in my opinion as well, but i suppose you could get buy without it, theres still manual focus and it's somewhat easy to get at, but you have to adjust it with the joystick and that's a pain. Also, something it's hugely lacking is multiple film settings... or something, i cant think of the word for it. Like with the gl2 (i think, i haven't read this or actually used a gl2, i held one once and messed with the setting for a second), you can have multiple things on auto, and keep one thing off... i think, or something to that effect. With the gs300 theres just one setting for manual controls, leaving all of them on. That wouldn't be that much of a problem if those controls were more accessible so i could change them on the fly.
In conclusion it's a good camera if you're not looking for manual control. If you just wanna go out and just point and shoot with pretty good quality, this is definitely a good choice.
Oh ya, some afterthoughts, the EVF (eyepiece) doesnt angle up, so if you have anything larger than the stock battery you wont be able to use the eyepiece. Theres no timelapse feature, which isnt that big of a deal i guess, some people want it though. On the plus side i found it very easy to do follow cams with, dont worry about making a handle for it, just get a fisheye and you're set.