It's actually a pretty rugged rig, probably the most reputable of the
mod-square inverters. I've heard of alot of Magnums failing, but no
DRs. They have, unfortunately, of late discontinuted their UL rating
for cottage/residential applications, which means they'd fail an
inspection by an electrical inspector if your installation required it.
I'd say the other negative issue was the non-digital interface for
setting charging rate and whatnot.
Truly, though, if I were you, I'd try to roll enough pennies to get
yourself an OutBack FX instead. True sinewave power, and rugged as hell
;-).
One thing to bear in mind as well. Most folks that get a DR have also
scrimped on the rest of the system, and have installed a fuse rather
than a DC disconnect (legal for 12v systems, gray-area in 24s) and even
while in "off" (not search) mode, have a slight draw, which over the
winter, has been known to kill small battery banks.
DJ