Anyone have or use one?  I saw an AquaCharge on Ship Shape the other day and decided I would get one for the boat, to replace the 800 GPM Rule I keep in the cuddy with alligator clips and 6' flex tubing.  Doing a google search, I found this Attwood for under $40, and was wondering if I should spend the extra $50 on the "good one".
 
Attwood
http://www.jamestowndistributors.com..._7766&type=pla
 
Rule
http://www.gandermountain.com/modper...ID=GSHOP_96791