I live at and manage a storage facility near Delta Hiway off Goodpasture Loop off Goodpasture Island Rd.
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I bought one for my escalade and it was soooo worth it after about 5-6k in repairs at the end of the 3 years I owned it. Ended up buying one for my Denali as well. And I'm sure as hell going to get one for my future 2015+ model too.
A very long list of things I'd have to look up the paperwork but some of the major ones were the autoride compressor and the AC compressor that both went out. Catalytic converter also started making this terrible sound and that was replaced too.
... They are another profit tool for those willing to listen to the scare tactic.