I had to buy one two years ago. I read a lot of reviews first and like you found them very, very hit or miss. I decided that it was going to be impossible to find a unit "blessed" by reviewers in general so I just went to Lowes and bought one. It's been fine so far (runs about 23.5 hours/day). It's going to be hard to find one that everybody likes.
Even for houses that are only partially sealed, mold can easily still be an issue. Only suggestion I have for this is opening a window in the bathroom to vent it out or keeping the door to the bathroom open so that it equalizes with the rest of the air in the house.
And yet you don't see the benefit to lowering humidity levels? My dehumidifier in the basement pulls the humidity down from about 75 to 45 or so. Instead of a fish tank it's actually comfortable down there. I have a five year old home with dry walls, sub-slab plastic, there's no way to better seal it, really. The fact is moisture gets in a basement since it's got dirt on a few sides. Lowering humidity, assuming you're insulated and sealed reasonably, is THE way to reduce mold and a dehumidifier is THE way to lower it.
I pump mine into the sump pit. On the slim chance my sump ever fails I even have a $10 battery-powered unit that alarms if water level gets above the cut-off, so that way I'll know, whether it's in the middle of a storm or whatever. No homeowner without a psychological problem (or they just have no sump pit) is going to empty their sump bucket each day. Everyone in my hood has a dehumidifier (and 95% of us have AC). One neighbor even has two.
God love ya for running in that. That's like running in a warm, uncomfortable pool.
I did it last weekend, stopped real short. It was just horrendous.