I have been looking at the SU-22 to add to my collection of 22's. So far I have a GSG-5, and 2 Ruger 10/22s. I have shot the Colt/Umarex M4 22lr and I didnt like it at all. The GSG-5 is awsome, and when I take it to the range I always get the "is that thing full auto" or "Is that a real can" comments. The main draw for me in the SU-22 is that I already have and SU-16, the black dog magazines and the E stock options. Any other advantages?

The GSG is cool looking and fun.
 
The 10/22 is inexpensive (usually, few companies beat Kel-Tec on cost) and very flexible and can be accessorized and modified to the extreme, but those mods come at a cost. I have a friend who had a very nice 10/22 with upgraded sights, a match trigger, and a stainless bull barrel. No scope, and he had $800 in it. He sold it and couldn't get his money back of course.
 
The SU-22 is very nice right out of the box, because of the high end SU-16 parts, and Kel-Tec offers a couple of stock options if you want to mod it. Hopefully, they'll offer the Charlie underfolder and the AR-style pistol grip collapsible stocks as factory options instead of making us buy the alpha stock with the rifle and then buy the charlie or AR stocks to upgrade.
 
I can say that I've already gotten my money's worth out of my SU-22C, and it's been my favorite gun to shoot the last 22 months. Everyone else likes it too. Tons of fun! It's a keeper!
 

I haven't tried the GSG-5.
I have a Colt M4 .22 and it's a great shooter for me
but I like my SU-22 is even better somehow.
I don't mind the original stock at all
and I'm excited about putting a can on it.
(hopefully in the next 2 weeks)

I've owned 5 KelTecs with a PMR-30 on order.
Kel-Tec rocks!
 
- videodon -

...a select fire SU-22...that'd be special!
I was going to try the bump fire trick though!

Quote from Stompy on 06/15/10 at 10:57:17:

I know a place where one could try the GSG-5/Kel Tec SU-22/Colt M4-AR 22/S&W M&P 15-22/ DPMS -Cinner-with dedicated 22 barrel/ and maybe a few others. All just for the asking   ;
 
 http://www.ktog.org/cgi-bin/yabb2/YaBB.pl?num=1252377613/0

Nice! That looks like alot of fun. I wish I could make it but Im too busy with work right now. I guess Ill just have to wait until one of my friends picks one up to try out the SU22. Thanks for all the great info.

I just measured the trigger pull on my SU-22 (after many thousands of rounds) at 7 pounds, 0.5 ounces (average of ten trigger pulls). On the plus side, the pull force is fairly consistent, between 6 pounds 14 ounces and 7 pounds 3 ounces.
 
The relatively heavy trigger pull is my biggest complaint about the SU-22. It uses the same trigger group as the SU-16 and PLR-16, even though .22 LR rimfire ammo requires much less force delivered by the firing pin to reliably operate.
 
A good gunsmith can lighten the trigger pull to 4 to 4.5 pounds and still maintain reliability (for the SU-16 or SU-22). I wanted to send my SU-22, SU-16 and PLR-16 to Bill Springfield for trigger jobs. I've mostly held off doing that because I thought I'd like to learn how to do it myself... as if I have time for more gun projects.
 
I like a short and light trigger on a rifle.

Quote from henktermaat on 08/19/10 at 18:35:06:

Everything from the hammer back and down (the trigger group) is the same on the PLR-16, PLR-22, SU-16 and SU-22. The firing pin forward is different for the .22 LR variants, as compared to the original .223 versions.
 
Maybe if I get the PLR-22 to add to the PLR-16, SU-22 and SU-16, I'll decide that four of them is worth figuring out the trigger job and I'll follow the instructions from the SU-16 FAQ.
 
I bet the first time it'd take some fiddling and trial and error to sneak up on it, but the last two would probably go fairly smoothly.