I had an ADCO, it lasted a little over two years (out of warranty). The sides literally disintegrated. Purchased another one, it lasted about 11 months and it the same thing, sides literally turned to dust. ADCO replaced it under warranty, but it is only a one time replacement warranty, after that you are on your own. When this one goes down I will look for something else although the other choices do not seem to be much if any better.
2009 Flagstaff HW27SC (NTU 2014)
1999 Ford F150