I have had a Morris (Rossi) 45 for about 2 years I run it on a GP F15 and it screams. I don't know where they are coming from when they say they are tempremental, because mine sure isn't, it starts easy and takes very little to no adjustment. I have also had 5-6 TT pro 46's and have loved them all, for the money they are the greatest. It all depends on what you want- the Rossi definately has more power and revs higher but $$$???