You're not missing out on much. I agree. The M seats on the X6M are not anywhere near to being as supportive as the M3 seats - especially laterally. The lack of adjustable bolsters is significant. The X6M seats ARE comfortable, though.
I think the optional comfort seats would be fine for the vast majority of people. We decided not to go with ventilated/perforated seats - I figured it would be hell on earth to keep crap out of the perforations.
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"Anima sana in corpore sano"
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