I picked up a 2015 SHO a couple of weeks ago, no major plans since it is a DD but I have enjoyed it so far. Mods include Livernois 93 octane tune, limo tint, black vinyl wrapped roof, and added the subwoofers I had in my Ram to the trunk.
I was worried about the interior from what I had read but it has been comfortable so far. It does wrap around me more than previous sedans I have owned but it actually gives the car a sportier feel for being as big as it is. I am 6' 3" and fit just fine.
MetroRestyling on Mound in Sterling Heights. It was 225 I think but they dented my roof doing it and claimed it came from the factory that way. I had to spend another 250 on paint less dent removal. I am happy with it now but can't say it was a good experience.