STM shock relocators

I have searched but have not found out much about them.... im thinking about getting the 1.5" ones because i think if i went with the bigger ones then they would rip off. How do they hold up? If i went with the 2.5" or even the 3.5" would there be a chance of ripping them off?

http://www.detoursusa.com/xjstm.php

Besides the problems they cause,at that price your half way to a new pair of good/properly sized shocks!