This adapter is great value for money. It is reassuringly solid and sturdy and does exactly as it should - allows you to mount your M42 lenses on your Fuji X bodies. For just a few quid you have access to a huge wealth of wonderful old lenses which can be bought at very reasonable prices because people don't want to focus manually any more - or maybe you have some M42 lenses stashed in the loft somewhere which you haven't used in years.In my case I have a Helios 44M (cheap as chips from eBay recently) and a couple of Super Takumar lenses handed down to me by my aunt and I believe about the same age as I am.I have been using this on an X-Pro1 and loving the results. Pop the adapter on, pop the lens on, switch to manual focussing and make sure you have focus peaking enabled on your camera. I found it much easier to use these vintage (and superb) lenses on my X-Pro1 with this adapter than I did with my EOS 6D - manual focussing is made a doddle. No reason to pay more than this, I'm tempted to get one for each M42 lens I own.I've attached a photo of a carved stone head from a church window taken using this adapter when I had the Helios 44M attached to it. This was shot with the Helios wide open at f2, manually focussed (of course) using the focus peaking feature of the X-Pro1. Focus nailed on the eye.