IMHO The Shaman did a nice workup on the UV stuff.
Just do a search for UV Killer and you will find a very enlightning thread. There were some points for the other side as well.
Again just my opinion, but this stuff is a pipe dream at best. Yes, deer see differently and yes your clothes may reflect light at certain wavelengths better at certain points of its life cycle, but does it scare deer? Not unless you do something to screw up is the bottom line. If you move when they are looking you attract attention with or without camo. I went hunting a few times right after work in a an old red and green carhart coverall and still had deer come within 10 yards of the stand looking right at me. They only took noticed when I turned my head to follow them. If you get winded before they see you your done, etc, etc...
This type of product, again in my opinion, really only gives you a sense of confidence that you may have a better chance at a deer, rather than making you "invisible" to deer. In the greater scheme of your hunting ritual this may be of value to you, but how much, only you can decide if the plunking down of 5, 8, or 10 bucks is worth it. The real story with this stuff is there is more money to be made hunting the hunter rather than hunting the deer.
Veni, Vidi, Sagittam Mittere, now I'm ready for my nap