I've put over 1000 paint balls through my SP-1 and may have chopped one last night, but the barrel still looked fairly clean, just saw a puff of paint from the end of the barrel once.
I have the longer trigger on mine and really like it. Most times I'll use my middle finger to pull the trigger more often than my index finger. As I'm learning to walk the trigger the longer trigger is needed for that.
iliveforthis: What feed neck are you speaking of? I'd like to get a Q lock for mine, but there is no mention of anything like that on the Smart Parts website.