I've played with both (currently own a 3, used a friends 2.0 for the day)...2.0 felt great! The setup with a rotor and 68/45 felt great, gun is very light, and sound and kick were minimal. It kind of reminded me of a very soft victory...nice smooth shot, but just a little bit of a slight "pop" sound to the shot...nothing like an ego or a vic, but not like a luxe, gt, etc. I was in love with the 2.0! So I hunted down a Geo 3...so far I've only thrown a few pods through it (and I didn't have a 2.0 to compare side by side), but it seemed to shoot very smooth and very quiet...it'll be neat to try it out next to a few of the Luxes next time I play just to compare...but otherwise I'm very happy with the sound and feel...also the gun feels great in hand, the features are amazing as always for a Planet Gun, and it does seem lighter and smaller...I know the weight is shaved off from the previous model...it'll be neat to see it next to a 2.0 next time I'm out as well, to see the size difference if there is any really.
If you can swing it, you might as well go for a 3...they have all of the perks of the 2.0/2.1 and more...but for the sake of saving money, hunt down a good deal on a 2.0/2.1...right now with the arrival of the LV1, you should actually find some great deals from guys trying to dump their Geo's for LV1 cash.
Good luck, hope that helped!
"This sport transcends all expectations. I thank God for this gift and the friends I have made playing."