I'm VERY curious about them, as a transsexual guy, I'll do just about anything to get closer to having a dick, plus my clit is unfortunately quite insensitive and hard to get off. I've read over and over about how pumps help insensitive clits, I can't get my mind off them. Part of my paycheck next week will probably go to getting this: link
as it seems to be the most powerful clit pump on the market under $40, plus it comes with a free pleasure ball
I generally really like Doc Johnson toys, I hope this one doesn't fail me!