Just purchased my 2nd BreatheSmart after having great results with the first one. My first one was placed in the basement with a Silver filter. Already had to change the filter (it was a "piece of cake"). Love the filter life indicator. The fitness equipment is now getting more use than it ever did before. My second one is placed in our open family, dining, kitchen area. Thanks very much for the panel color options. It blends in well. Next we are looking to place one in the Master Bedroom. Don't know if we should go with the FIT50 or T500 option. The ability to travel with the T500 is a great selling point. Maybe I'll have to get both.