Which M42 to M4/3 Adapter?

I am looking to put some vintage glass on my GH2 but am unsure which adapter to purchase. I have been looking at the RAINBOWIMAGING, Fotodiox, and RJ Camera versions but am open to any suggestions.

I have heard that the Fotodiox works perfectly with most M42 lenses, but some do not focus to infinity. The rainbowimage one does not focus to infitinity, and the adapter must be loosened to change the aperture, so that one is at the bottom of my list. I cannot find much information on the RJ camera version.
 
I think I have the Rainbow Imaging one (it says Fotosy on the actual adapter, so now I don't remember, but I'm 99% sure that's it). It works great. I've never had to loosen the adapter to change aperture, and I'm pretty sure I have infinity focus with all my lenses.
 
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