Hi Marmota ,
My wife has XT in her Plus Eight ( cream ) it has been very wet inside her car and the XL leather took no harm . I have just taken delivery of a new 110 M3W with cream Xl leather with orange diamond stitching , due to a serious illness the M3W has not been used much rain or sun but I am sure I have made the best decision on the choice of materials. Go for it.

Regards V8HENRY