I've only gone by the way of the Velos.
I am a sucker for great customer service...Omar and his team provide above and beyond.
...I don't even really need to mention the tune but I will. It's pretty damn amazing.
2008 Interlagos Blue E90 M3 (Retired)
2012 Black Sapphire Metallic X5 M (Velos Designwerks Tune, LUX H8 V3 Angel Eyes, Black Sapphire Metallic Kidneys and Roundels, M floor mats
2009 Black Cadillac Escalade Hybrid