So will it fit into the B&W case? Will it fit into the TSA X-ray channel? Will it take the T-bag + lamp underneath in the front?
No wish to take my Brompton on a plane,and never used my front carrier block,so for me these are non-issues. I'd much rather save a couple pounds and be able to remove the rear wheel without tools.
Will the derailleur survive curb riding?
Never had an issue with my Mezzo or Mu SL. I have a client who's been to my clinic several times with a Helios SL;her derailleur hangs just as low as the MIT's and she hasn't had an issue. The Helios is her only bike and she rides it every day.