Originally Posted by pacificcyclist

The Dahon X10 has one of the stiffest frame on the folder front, definitely stiffer than the Tikit which translates to a more responsive ride. You probably notice this already, so I am not sure why you are planning on a downgrade? Secondly, it is easy to setup the Dahon seatpost during assembly. It is called a Sharpie. Use it to mark the position of your post and then install it back to your bike. Same with the handlebar with the Syntace gadget. On my last bike trip, it literally took me less than 1 minute to setup the bar and seatpost position. The Mu bike is easier to setup than the lower end Dahon bikes btw. It took me a bit longer to re-assemble the derailleur hanger and derailleur back to the frame as I took that off when it was in its suitcase. There is a slight advantage to the Bike Friday setup on this respect, but not a deal breaker.

If you are a strong good rider, you should have no problems keeping up with the roadies. Drafting is easy on a folding bike down to the smaller front wheel, allowing you to suck behind. My Mu SL was good in that respect after my last trip which happened 1 week ago. The wider and lower pressure Big Apple tires helped keep my speeds up more than my Stelvios, but also provide better cushioning.
Your X10, like my Mu SL, package is really ideal for fast rides. Just add a low bail out chain ring and you will be fine.

Since I have used my Mu SL on a few air trips already, I never regretted going to the Dahon.

For the upgrade, I probably be looking at the Tern Verge X30h as the replacement to the Mu SL.

Lastly, all Bike Friday bikes are meant to fit into the Samsonite Flite case they sell