Great product
Tiffen is a great company for getting a camera lens, will buy this brand again.

You get what you pay for
I am comparing this with an multi-coated UV filter that is twice the price, and the difference is evident. This is not a bad filter by any means, but if you have a good lens, you owe it to yourself to get a better filter - you'll see the difference.

SAVED MY LENS
As the title states this lens saved my lens. I put UV filters on all my lenses more for protection than anything. I had an incident where I picked up my camera the wrong way, and well it dropped. Fell right on the filter, which if it wasn't there instead of costing me the less than this lens cost me, I would have had to replace a 0 lens. The lens is in perfect working condition.

As for picture quality of it, really it's just a matter of ensuring you clean it ever so often (hot water and/or lens cleaner).

Basic filter
No optical problems and mechanically sound. No loosening of the retaining ring, as with some filters. Only issue is that I wish it were thinner.

Great against drops
Brought it mostly to protect my expensive Canon L lens. My wife dropped the camera this week and broke the filter, but not a single scratch to the lens. Worked exactly as expected :) Wouldn't recommend dropping your camera just to test the filter, but if it happens, there's a good chance your lens will survive.

Also didn't see any chromatic alterations after using the filter. So far photos and colors are true to original.