At first blush this is the same as the Ecotemp model I have, just a different brand. No complaints other than the bulk.There are a lot of solutions out there I'd love to see what people are using and their impressions. Since I carry propane have water tank and 12v pump I was considering something like this:
http://www.homedepot.com/p/MAREY-2-0-GPM-Liquid-Propane-Gas-Portable-Tankless-Water-Heater-GA5PORT/204357330?cm_mmc=Shopping|THD|G|0|G-VF-PLA-D26P-WaterHeaters|
I previously posted talking about the fiddlyness, but it's not too bad as I just used it this past weekend. The key is to prime the system in stages -- prime the pump lines, THEN prime the shower. Doing it all at once causes air to get trapped.