Yes i use one almost exclusively in the UFS, been going now for 9 weeks, i always ignore all the hype and ridiculous claims made with products and buy to satisfy my own curiosity.
Of the two types available, short barrel, long barrel, i would recommend the long barrel, firstly the length of the longer barrel will enable you to use the UFS to it's full liquid capacity, short barrel will need to be used in "shorty" mode
Secondly and more importantly in my view is the shorter barrel seems to spit juice on occasion, not very pleasant, so the longer barrel prevents this from happening, think of it maybe as a 306 atty wrapped in a 510 body, the initial price is expensive but if i can get a minimum of 9 weeks out of one then it negates the steep price.
I can only comment on the performance of the ones i have owned, i did follow the common sense instructions of keeping it wet and cleaning once a week in vodka, other people have had them fail much earlier, maybe user error, maybe product error, you pay your money and take your chance i suppose