I'm surprised you heard negative comments about their warranty service. I've had one experience with it and thought it was excellent. I have an early BF Pocket Rocket and when it was about 10 years old I discovered a crack in one of the stays while on a Thanksgiving Day ride. Called up the company on their 800 number that afternoon expecting to leave a message (it was dinner time on Thanksgiving) and someone there picked up immediately and gave me instructions to have the bike sent to them by Fedex at their expense so it could be repaired. I mentioned that there was no rush since I was at home and had other bikes available but one week later I got the bike back from Fedex with a new rear triangle. The bike is now 20 years old and I've had no further problems (beyond an occasional flat tire).

BTW, you list the Tikit model which has the same wheel size as the Brompton (16"). BF markets this model more for the multi-mode commuter although it (and the Brompton) can certainly be used for touring as well. But the BF models specifically targeted towards touring are more the New World Tourist and Pocket Rockets which have 20" wheels (both 406 and 451mm versions of 20" wheels are available). These don't fold quite as quickly as the Tikit (or Brompton), but fit into airline-legal suitcases with a bit of disassembly and folding.