I've owned one of these GE FL washers for nearly a year now, and the UltraFresh Vent System works exactly as advertised. I can safely leave the door shut; after running an 8-hour venting cycle in which the drum slowly spins on and off, everything is bone dry inside. Keeping the door closed is very beneficial, as it prevents any one of our three small dogs, or the cat, from unexpectedly jumping inside.
This washer features "SmartDispense," in which a tank in the detergent drawer holds up to 50 oz. of liquid detergent. The machine then automatically dispenses the right amount of detergent depending on the load size. I can even adjust how much gets dispensed (Auto, More or Less). This is incredibly handy, taking the guesswork out of manual measuring.
I almost always wash laundry in warm, or in some cases, hot water. However, late last year, I found out that cold water combined with an enzyme cleaner works wonders on dog bedding. This combination takes the odors right out.
Lastly, the LG FL at my old house had a tendency to develop a funky smell inside, despite me wiping down the door glass and gasket at the end of laundry day. Turns out that some dirt would build up in the bottom of the gasket. There was even a magnetic plunger that kept the door ajar, so that fresh air could circulate into the drum.