NX, vintage lenses and Ebay adapters...any problems?

I use manual lens on my nx100 all the time adapters I use are

Rainbowimaging adapters and this guy made one for miranda lens he has a few other very good adapters. http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=170969439351

lens I use are konica 40mm 1.8f, konica 135 3.5f, miranda 50mm 1.4f, miranda 35mm 2.8f, vivitar 300mm . All are great and I didn't pay more than $30. us for any of them on ebay.  the 135 and the 300 i use lens rings on with a mono pod so weight is not a problem

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The best picture is the one you take.
Jeff