I decided to get a tanning mitt because I was sick of washing all the fake tan off my hands. I picked this one because it was one of the cheapest available at the time.
In terms of results, using a tanning mitt is way better than using your hands. It is streak free and quicker to apply. The product is also more evenly distributed but possibly also lighter.
I find a lot of product gets into the mit so I recommend washing after each use. I just use shampoo and water.
I also found having a brown mitt is a good idea if you don't want the excess product to be noticable.
i had purchased some new fake tan after years of applying gradual tanners - was nervous about streaks so I purchased this. It worked perfectly! Made it easy to apply the fake tan and I have no streaks! yay! I do wonder about the longevity of it though - have only used it about 4 or 5 times and it feels like it may not last much longer.