The Mueller scopes are definately great optics, I have 4 of them, in fact, my first was an Eraticator mounted on my 917V....but I ended up with a pair of Scopechiefs that are more suited to my use as a carry rifle on the 917V(S) for ground squirrels. The Eraticator is now on my .204 Ruger Handirifle.
I don't think there are any trigger changes to the 2005 model, but I don't know that for a fact, I doubt RB knows for that matter, the VSF hasn't been out long enough. The trigger is a drop in with plain instructions but the adjustment can be a bit tricky. I installed one in both my 917V and 917VS, one was easy, the other took more time to adjust and some of those at RFC have had some trouble, too. The folks at RB are real helpful if you need to ask questions. You can download the instruction at the RB web site of you would like to check em out...Good shooting!!
Tim