I've never had a marker as consistant as my ion is with a sidewinder on. I've often got the same velocity for each shot from the chrono judge to their surprise
I bought from DBN paintball, but he has no more left it would appear. And it cost about 35quid shippind for a brand new reg from USA.
If you can get one, snap it right up. Great regs and they look better than anything else i've seen on an ion, or most markers in fact!