Here is my OM lens mounted via SB on my Nex 5R. Gives my 24mm f2.8 OM lens close to 24mm focal length on an APS-C body with an advantage of 1 stop of light!
What a great rig! True Finder, touch-screen, speed boosted OM 24mm, excellent video of NEX5. This setup gives near full-frame performance for a fraction of the price. I am seriously thinking of buying a NEX5T today, when the prices are so great from second hand buyer perspective. The True Finder is still quite expensive, though. I am a Metabones Speed Booster fan, too. I regard
Speed Booster as part of the system, it is glued to my camera: all my lenses are compatible with my Speed Booster (I don't use AF lenses at all). Speed Booster converted my APS-C camera into a (near) full-frame system.

Speed Booster is for manual focus aficionados, who prefer lenses to camera bodies.
Take care, Miki