A4 B8 - want to play spotify through bluetooth

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I've spent most of the day trying to work out whats the best way to play spotify through my A4. I've looked at Tune2air, various bluetooth after market attachments but all the reviews are mixed and I cant get to a conclusion. Anyone got any experience?

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Just for anyone's future reference who may be looking I purchased this for £17

http://www.amazon.co.uk/gp/product/B0179RB7K8?psc=...

Seems to work fine, I couldn't find anything that works the mmi inc steering wheel controls via bluetooth