We tested many and found that there are only 2 that work, one we sell, one we don't. Basically what it comes down to is that "yes the majority of them are junk". You can pay a price range of $14-$250 for what you can pick up at any boating supply store.
Find out about Manufacturers Warranty, if theres none then it's junk!
Find out what the fans are made of, if it's plastic then it's junk!
Now I'm sure by now you want to know what we found that actually works
1) the electric turbo (yes this is the one we carry)
check it out at
www.cargodzcc.com
2) the Thomas Knight Turbo (we don't carry it because we think it cost to much $1995.00 and you still have to buy more stuff to run it)
check it out at
www.boosthead.com