Is there a particular reason why people recommend the freak or is it an attempt to justify an illadvised purchase made by themselves?
I am curious because I have one and they are shockingly awful. My friend has one it is also awful. Another friend had one and that too was awful.
As far as multi-bore barrels sets go the evil pipe kit has alway been better from my experience as it lined up straighter (but never perfect), not as easy to damage the backs/inserts, not rifled porting and looks better than the freak system.
BUT.... The best barrel at the moment though is the un1tec barrel from Lucky. Ignore the bollocks about how people say how light and quite it is, that doesnt matter and in no way helps me come to my conclusion. The key feature of this barrel kit is the fact that it offers multiple bore widths with NO STEP! The advantages this has over any other multi-bore barrel set is obvious to anyone.