I agree with other that there is a lose of "feeling" through using this item, but you quickly get used to it. The build quality is fantastic and although I've had mine on my keys now for around 5 years, the product is still in very good condition, with only a few minor scratches.
My main gripe with the product is the screw - it sticks out the sides and easily comes loose in your pocket and can fall off, so you need to make sure you tighten it up each time you take your keys out. I lost my first screw after about 6 months of having this product and spent sooo long looking for a replacement on the net that I gave up. I kept looking every month or so only to be put off by not finding anything (except for in America with stupid shipping costs). Eventually I found some place that sold them quite cheap and with cheap shipping from America. Be warned, if you do lose the screw, there are no UK suppliers for spare screws (as far as I have found).
Other than that, great product that looks good, but most importantly, works.