Hi! Yes I have a bertini shuttle what kind of problems are you having? I am quite a small person(4ft11in) and I sometimes find it hard to lift the safety catch as I'm not tall enough, but the only problem I had was with my wheels squeaking and all that was was that we had gotten dust in between the buts and pieces and I just blew and cleaned it out and it was fine. Overall I'm really happy with the pram, I find it funny when I'm at the shops and people just stare at me with their mouths open wondering how I lift it in & out of the car. My only real beef is that the handle dosen't turn around to face the baby. If they released a shuttle like that I think I'd definately consider it. Let me know how you get on with it.
PS If you take your pram on the beach in the soft sand make sure you have it on 2 Wheel Drive not 4 because it will turn as it tries to go over the bumps. (My sis-in-law has one and you should have seen the 2 of us trying to push the prams. It must have been a riot!)
CJ, SJ 3/03, AJ 11/05, PJ 4/08