ok here it is...apr is decent but is a little tricky sometimes...bosst is there one minute then boost is gone the next, its a little tricky...and neuspeed is garbage, dont get their chip. come over and ask us on www.dubdojo.com they'll tell ya the same. stick with a giac or revo. fixx is ok with all their chip tuning, but take for instance me: im getting my giac from suncoast porsche down here in sarasota, heres the reason: they call giac on a DAILY basis and they do all their stuff on the spot, so if there was ANY problem, they fix it for you then and there. not trying to take anything from fixx, but suncoast is exclusive for the giac in-house and is a littl emore but ur a lot safer down the road...just my 2 cents...