I've been running birds for a few years now and have had zero moisture/condensation problems on my 700, 800, and 900 series units. I'm sure it happens obviously as the op has problems now but I can't remember another time Ive heard of the si units having a hard time with this.
Im not saying the older ones didn't have that problem especially since Fish24/7 had a really bad time but the newer units don't seem to have that reputation.