I have a few Pentax K mount lenses that I want to use and these seem as solid as any in that price range. I can't see spending close to $200 for an adapter, I'd just buy an equivalent lens for that price, or at least towards a native lens. Are they smooth and do they dismount easily? That's my biggest concern with the cheapo adapters is that they get stuck on the brand new E-PM1 body. The lenses I'll use haven't been used in 20 years, so I'm not too worried about them. I have a Tokina Kmount 70-210, a Pentax SMC-A 35-70, a Yashinon 50 f1.7 screw mount, and a Nikon AF 28-80. Nothing particularly great, but worth a try, except maybe the Nikon as it probably is barely worth the cost of the mount, given the range I have with the Pentax lenses, plus the 14-42 kit lens. Also, since this camera is for my daughter and it her first serious camera, I'm not sure a manual focus lens will be the best thing, although when I was her age, all we had was manual focus (that Yashinon lens btw). I was trying to find an address for RainbowImaging but they don't seem to have one. They are in Brooklyn is all I can tell, and so am I.