I have to say John, I'm really enjoying my shortened r10.. it may be a bit much weight wise mainly because of the bottle but in PCP world it's great as you can leave your charging kit at home because you know you have the shot count.
I think the ultras are great but again.. it's charging equipment for the low shot count.
The other argument is "if it ant broke don't fix it!!" And continue your love affair with your fenman