I am taking my Bike Friday Crusoe to Japan in a couple of weeks. Last year I took it on a tour of Virginia. At home, I have it set up on a trainer. It is very convenient to half fold it ( one minute instead of the 15-30 it takes to get it into the suitcase) and put it in a car trunk on a driving trip. No worries about theft, rear ending of car or bad weather. No extra fees on the airlines.
If you set it up the same as your road bike, after a few minutes you don't even know that you are riding a bike with small tires. It is a little slower than my Ruby, and when I am home, I prefer my road bike. Still, it's got a lot of uses - far better, I think, than renting a bike that might not fit correctly. I would give your boyfriend's Friday a try for this trip so that you could make up your own mind. I find it to be a very useful second bike.
2007 Ruby Comp/Specialized Dolce
2004 Bike Friday Crusoe/Specialized Dolce