How are you mounting it to your '10? I have been looking for the hardware to do that but the prices are $150+ without the trunk which seems kinda high for a few pieces of metal tubing.
I placed an order for the SW-Motech Aluminum Rack based on looks and some great feedback from other V owners. Unfortunately, the ship date is July 19. So I have a nice trunk I cant use for 2 months. (Good things come to those who wait) I have always heard and believe.
As far a cost, everything motorcycle is expensive. This Topcase only setup is going to cost me just over $500 including the gel backrest pad, case, mounts, & Givi adapter plate. I have spent more than that on just saddlebags & mounts in the past on my cruisers.
Try to keep in mind what goes into these products. Engineering time for design and likely many prototypes. Then, they must order the materials, make jigs, cut, bend, weld, clean, powdercote, package, then internationally ship product and still pay the bills along the way. $150 seem reasonable to me.
Good luck with your setup, let me know how you decide to proceed!