When I had UPZ RC10, I used the UPZ Power Strap SHOXXTER Plus straps (which have a ratchet instead of buckle) for a short period of time. But I found them too locked for a top strap so I gave them to my friend in Japan who wanted a set.
Then I switched to a WC Booster, which was great, but I ended up giving that away too because I switched to a G-Style top strap, which I prefer because it offers the same little bit of give the Booster does, but I can unbuckle it on the lift.
Now on my carve boots I run a G-Style top strap and on my softer all mountain boots I run an Intermediate Booster.