How good are those attachable pipe vaporizers?

I've heard and read up on portable pipeable attacthed vaporizers. Is it too good to be true or does it live up to its name?

www.hugegrins.com Check it out...the mini vape

Hi Jake how about this one

http://www.inavap.com/mainframe.php

$109 seems like a good price to me.:confused:

How do you tell the difference be conduction and convection?