I've had a Turbo/Maxx fan on my TT for over 10 years. It's been reliable and effective at moving large volumes of air through the TT. The thermostat is handy as you don't have to get up in the middle of the night to turn it off. It can be a little noisy; especially at higher speeds, so I would recommend not mounting it in a bedroom unless that's your only option. When not in use, it serves as a Maxx/Air cover and permits you keep your roof vent open for year 'round ventilation. The fan can be run during inclement weather, but I would suggest using it in exhaust mode during these times to avoid drawing the rain into the fan.
When using the fan on exhaust in a bathroom, you might want to open your bathroom door fully before you flush. Otherwise, fumes can be drawn up from black tank due to the partial vacuum that's created with the door closed.
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TV: 2009 GMC Sierra 2500HD | Crew Cab | Std. Box | 4WD | Duramax/Allison
RV: 2000 Jayco Eagle 266 | FBS | TT -- 1986 Coleman Laramie pop-up -- Still in the family!!!