There isn't exactly anything to be vouched for here. You put in a list, and it tells your the possibly available ones. It's a simple program that always going to give you results. The only small problem is with the social mediums themselves and how the program checks them sometimes. For example, Tumblr checks to see if the url is taken, and if the account is banned and comes up as a 404, it will say it's available. However, this is being worked on currently to be fixed. $30 isn't exactly much for this checker, consdering the amount of mediums it checks and that you can make your money back in less than a day easily from selling some nice ones that you get. Lastly, I'd only give out the program to Staff or an extremely close friend for vouches, sorry.