Anybody have experience with Bavsound?

I hope you won't mind a question about auto sound, but the advice and experience of A'goners is more reliable than elsewhere, so here goes.  I'm tempted to try to upgrade the subs in my BMW X3 and Bavsound markets upgraded speakers and subs especially for BMW's.  But it's difficult to find competent reviews of their upgrades.  I'd like to chat with anyone here who might have some experience with Bavsound?  Thanks....