About two years ago, we added a Terk XMDGM100 XM satellite kit to factory head unit in a 2005 Impala. It always drained the battery dead in 24 hours. Could never obtain the firmware update for it which was the problem. Since then, we were very leery of adding anything to the factory radio. Decided we would give it another try with a ISGM575. Works flawlessly so now we have plenty of IPod music for the road and best of all no Sirius XM monthly subscription fee. Price of ISGM575 was more than competitive and the shipping was extremely fast. Will probably purchase another one or two of these for our other GM vehicles. Highly recommend this Seller.

Rating: [5 of 5 Stars!]