I just ordered the Audi version of http://coolstreamrocks.com/product-catalog/ and received it yesterday. So far I've only used it on my drive to work this morning but I was able to connect to it and the MMI phone system without any issue on my Galaxy S6. I was able to make a call while listening to youtube (it paused the video and switched to phone automatically).
I ordered it over the Tune2Air based on the negative reviews on Amazon. There is not a single negative review for the CoolStream.
Right now Amazon is having stocking issues on the CoolStream device and the manufacturer's website is temporarily out of stock (I guess I ordered the last one) but you might try contacting them if you're looking for an alternative to Tune2Air and are wondering how long before they restock the product.
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