I've only had these machines for a couple weeks. I love them. They wash extremely well as well as dry fast even within the washer, but I do use the dryer. I have yet to completely understand the vent system and how long that's suppose to run, but I haven't detected any smell of mold using the washer and didn't use the vent setting. So far its great!
I have mixed loads of towels, sheets, and clothes in this dryer so far many times, everything comes out dry without any additional cycles. The biggest feature I really like on this model is the lint screen. While it isn't really a "one handed" cleanup, as you need to unsnap it to open it, it catches ALL of the lint. The only real downfall of the much older design I had before was the inability to easily clean the lint trap, it took a special vacuum nozzle to reach down and get most of the remainder out. This absolutely catches ALL of it, really happy about that.
Have you ever had a dryer that lights up inside? No more wondering if you got everything out, now you can see clearly. Plus this tub is huge and the dry time is excellent.