I know, I worked for way too long in the (tech- B2B) sales biz and recognized immediately this guy is a typical 'sales type', ugh. Unfortunately way too many 'consumers' can't or won't spend the time to dig in on specs - these speaker sets at U.S. $900 or so are not a cheap upgrade in my book; were I in the market I'd be wanting to see specs compared to OEM BMW to know if they are really a decent improvement.
I'm not considering upgrading speakers - I drive a 2012 X3 and recently installed a used B-Tech DSP amp - nice upgrade and good enough for my 'truck', um...SUV,
SAV 
I've read some other posts on folks who have done upgraded speakers, one guy mentioned that Bavarian Autosport also sells what appears be the same speakers as BavAuto - I sent them an email inquiry also, no reply so far.
Thanks/Bill