mattywrote a review of Thule Vertex Bike Rack - 4 Bike on July 1, 2015
Familiarity: I've used it several times
Very pleased with this rack. It is pretty heavy, but doesn't sway or bounce as I roll down the highway. It helps that I could use the included strap to secure the rack to my spare tire.
I've got a size Medium frame Santa Cruz 5010 hanging on there, and I'm not sure I am hanging it in the best way. Between the suspension and all the hydraulic lines, this is the best mounting method I've come up with.