I have only used the Jack Off Pump out of the three. It does OK but the sleeve inside is sort of pointless unless you have a 2" diameter cock. I would spend a little bit more and buy the Stamina Pump instead. The soft parts are silicone so they will last forever and you can sanitize it as well. Plus, the sealing sleeve works better.

Now if this is your first pump you might want to get a cheap one to see if you like them. The results are at best temporary and novelty may wear of quickly. Don't forget a good fitting cock ring to help retain the larger erection.