Bought one of these through an Amazon retailer & left it running OK for a fortnight's holiday, but when we returned it was dead.
Opening it up, it had leaked water into the battery compartment, trashing itself and the batteries. Not sure where the water got in, as the box seal was good, as were the screw seals. Looks like it came in through a hole between the battery compartment and the controller, so there must have been an internal leak that didn't flush itself out of the hole at the bottom.
I see another model being listed as a leaker as well, so not sure what to replace it with.