Welcome SMR. There is a Gen II that seems to have been pushed to a back burner for awhile. It really has no effect or change on the CM9 which will stay the same.
If one reads one can find negative reviews about nearly any brand of any product. You can also find glowing reviews about stuff that is well known junk.
Personally I think the chances you getting a good CM9 are very good. At most it might need a tweek or two but most likely not.
Plenty of help here if you do have an issue and while no one likes to think about needing it, it is warrantied and Kahr will take care of it if needed.
Short answer is buy with confidence.
In Memory of Paul "Dietrich" Stines.
Dad: Say something nice to your cousin Shirley
Dietrich: For a fat girl you sure don't sweat much.
Cue sound of Head slap.
RIP Muggsy & TMan
"If you are a warrior legally authorized to carry a weapon and you step outside without that weapon, then you become a sheep, pretending that JOCKO will not come today."