Has anyone got a Thule 925 with a boost bike? Will be putting one boost and one normal bike on just wondering if there is a enough clearance or better going for the 3 bike version?

It depends on the bikes themselves and how you load them but the 925 can be a bit snug.

The Velospace XT is probably as better bet if you can stretch to it, it’s designed for anything long, heavy or wide.