I have used Nel Splat which really suck .I have used PMI premiums which are decent but a bit too small.We all have messed up and bought Brass Eagle......
Bob Long Millenium, AKA internals , Palmer Reg, J& J ceramic barrel
I have used Smart parts Barrels , Stock Kingman and Tippmann barrels and my J&J ceramic with no problem at all
These seem to have a really good consistancy.The balls don't have bad seams.Very good paint quality , as far as thickness is concerned , and good flight qualities.Great in cold weather.
The only problem I have really seen is that they have a tendency not to break all the time on target.They don't call them "pro bounce" for nothing.It really helps to aim for hard spots such as googles, marker , etc.
A really good medium to large bore paint that is good in cold weather with good consistancy in both size and performance.These aren't marballizer , but for 20$ less a case they sure do the trick.Look for a color called whupass as it looks like it takes batteries its so bright