Warning: this may sound like a commercial.

I'm surprised no one in this thread or anywhere in the FB forum has mentioned my favorite Xootr Swift upgrade - the Redshift ShockStop suspension stem. I've gone from a standard stem with Big Apples to the ShockStop with Primo Comets at 90psi and the improvement is dramatic - ride is smoother, bike feels quicker and more fun to ride. ShockStop is probably overpriced for a stem but is reasonable when considering other ways of adding a bit of suspension to the bike. Best thing is it doesn't compromise the rock solid feel of the Swift when climbing out of the saddle, which is the reason I prefer the Swift to most other folders. YMMV on this last point: I use the 30 degree stem with the stock (short) handlebars; if you used the 5 degree model with longer bars or drop bars you'd probably create more torque.

Anyway, as someone who goes back and forth trying to figure out the best compromise between comfort and performance, this has felt like the Holy Grail for a 20 incher. For me, it took the Swift from being a good folder to a great folder.