M5 Guru (>2000 posts)
Join Date: Nov 2008
Location: New England
Thanked 762 Times in 621 Posts
I can't speak highly enough about Module Masters. They noticed during testing that my unit had an internal fault that may or may not render the unit inoperable in my M5. They attempted the repair anyway, it didn't work unfortunately so they refunded my money totally, no questions asked.
2/2001 M5, Jet Black, Exclusive Complete Black Walk Nappa Point Heritage Leather, Black Cubic Trim
8/2011 X5 xDrive35d Sport, Black Sapphire Metallic, Black Nevada Leather, Fine Burr Walnut Trim