I had a 17C and I kick myself for getting rid of it. Much soffter shooting. You do have the "rabbit ears" that appear when firing, from the comp slots but they do not impede your ability to maintain sight picture.
A friend shoots a 21c and it is smooth and accurate. I have yet to shoot the 10mm so I'm not sure about recoil but sight picture should not be affected.
The only real negitive is total loss of night vision when 1st round goes downrange. Even though you are affected with a uncompensated pistol the comp slots will spit out a lot of flame, and it will be right in front of your face vs. out the end of a barrel.
I personally feel the positive outweighs the negetive if you want a softer recoil. My opinion.