It is quite unfortunate what I have gone through on the service side, but if you get a good one that does not break, then you have one of the best watches going.
The real pity is the lost opportunity by Montblanc. A strong service experience encourages and owner to be fully at ease and confident, and consider more options from the brand. My experience instead forces me to contemplate selling the watch, even if returned in proper order.
But I wish you the very best with an 1858 if you get one.