I've bought a few of these in various sizes (although none from Amazon - nothing against Amazon, their price is keen, I just happened to buy them somewhere else).
The main reason I get UV filters is as lens protectors. The main reason I buy these Hoya HMC ones is that they introduce relatively little glare and distortion. I haven't been tempted by the more expensive "pro" ones, although they're lower-profile, which can't be bad (but they're quite a lot pricier).
Despite the assurances of certain reviewers, and many high-street retailers, these genuinely are very much better than the usual kind of cheap filters which retailers often try to tell you are "the same". In particular, the amount of light reflected by the Hoya HMC coating is negligible compared with a typical store's-own-brand. (There might be exceptions, but I've yet to see one.) To compare quickly in a shop, hold each flat in front of you and tilt it around looking for reflections of lights etc. An effect like a mirror isn't good. With these Hoya HMC ones, you'll see only dim green images of bright lights.
These are by no means the only decent filter on the market, but they're much better than most, by an obvious margin. They're really not that expensive when you consider that they're likely to be influencing every shot you take with a lens you probably paid a small fortune for. Optically, the best filter is none at all, but lenses are rather expensive to replace.