...meant '...or HOW well they work'...
You can get a pretty good VED (Vacuum Erection Device) from Walgreen's online - it's called "Pos-t-Vac" & costs about $100. That seems a little pricey, but some of the 'medical quality' pumps can cost $300 or more. You can find cheaper ones online but I can't vouch for how well-made they are or well they work. Good luck to you...