APR do great stuff, but when you get defects on it they don't honor their warranty.
I have Scars in my tailpipes and was told they had replacements in production for and the didn't keep their word. No idea in having great hardware if you don't keep the customer service up.
Milltek may not be the best quality items, but they DO honor their warranty.
Also i have had better support of my REVO map than i had for my APR map, they (APR) changed the map finally after 60+ mails.
So i'm not sure what i think of them until a replacement backbox is in the mailbox