The IF concept is really one of the most amazing solutions for most people in need of "fold-able" bikes. But as Chucky said, the concept made it really difficult to get into a suitcase, excluding it from being a good fit for me.

Thank you for the contribution Chucky. I do have a mountain bike background, and yes, we do make the bike "walk" over things! That was a nice way to put it.

What I really need is a bike the size of the carry me, the price of a Citizen bike, that rides like a Bike Friday and the weight of a Cervello P4, that is good enough for double centuries.

Unfortunately, the Brompton is significantly bigger than the carry me;
Unfortunately, the Brompton is significantly (several times) more expensive than any Citizen bike;
Unfortunately, the Brompton does not ride like a Bike Friday, or Birdy, or Swift;
Unfortunately, the Brompton is significantly heavier than the P4;
Unfortunately, after 120 miles or so, I start to feel the lack of a perfect geometry, so the Brompton is not ideal for double centuries.

BUT...unfortunately, the Brompton is the best I can get for my unique, special needs. Believe me, I tried almost everything else...and will continue to try since I believe diversity leads to evolution.