Had Dinan software on E46M3 (stage 3), E90M3 (stage 2) but went with Veolos on X5M due to it's cost and I don't see much different between software (mostly very similar gain). Also heard great thing about the Velos customer service after I was PM-ing the S**T out of Velos owners in the forum.
Had it for 7 months. Great service. Help me to solve issue after dealer visit etc.
I'm very happy with their tune and the top notch customer service.