Top critical review
Update/Downgrade: 2 years and 2 months after purchase (just outside of warranty period) kills batteries when on shore power.
July 15, 2013
Simple plug in installation (AC) and 3 wire hookup on the DC side (pos,neg, ground). Automatically switches between fast,normal, and float mode, each of which charges at the optimal rate. Most importantly doesn't trip the GFCI outlet in my garage when connected to 15amp shore power at home (unlike the new IOTA DLS-55/IQ4 I had to recently send back to the factory for "repair.").
I bought this one with two day delivery because we have a trip coming up and can't wait several weeks for IOTA to decide what they are going to do with the defective DLS-55 I RMA'd last week. It's nice when a product does what it supposed to do and this is one. A+