Do you not see it as being a benefit that the suspension can be switched, on the fly, from a very supple suspension that provides a comfortable ride to a very firm and sporty suspension that is very responsive? If you don't get that this is something worth $900 then I'm not sure why it should be discussed. The only time someone should pass on the adaptive-m suspension is if they don't want to outlay the cash, don't drive the car in sporty fashion (ever) or believe that the regular sport suspension can be pushed "harder" than the adaptive setup.
I don't provide lease/finance advice via personal message, so please don't PM me asking for personal assistance with your lease. My time is valuable as is yours, thanks.