Yep, I replaced the frame on my V1 Alu for a cosmetically damaged V1 Ti in one of Alpkits yard sales. The geometry feels exactly the same to me, but there is a little more suppleness in the ride quality. However, perhaps unsurprisingly, nowhere near as much as my aluminium running ‘nice’ 650b wheel & 50c tyre combo.
I flogged my 650b wheels to fund the frame swap…Doh! I guess the Ti frame with 650’s would be the brilliant. However, IMO unless you can get a whopping discount on a Ti frame, I’d not bother and would spend some money on some nice 650b wheels & tyres (er..assuming you’ve not already got some).