1) you did choose the T-screw version instead of the hyperfold. Why?
Not sure why, seemed simpler and less likely to malfunction. It also seemed I would be able to tighten it down more and get the hinge stiffer. In practice, I am a bit leery of the plastic twiddly knob as it seems like it may strip easily if torqued too hard. I am looking into getting an all metal knob to replace it.
2) there have been reviews on the Tikit saying the front hinge has play. Is that true?
The stem hinge had some play at first. Then I got BF to send me a new twiddly knob (as the first one was actually bent) and they also recommended to tighten the hinge screw a bit. This seemed to solve the problem. I also experimented with a thin piece of stiff cardboard in the hinge between the plates, this actually stiffened it up even more to where no play was noticeable.
3) when folded, does the ahead stem stick out? Could not BF give it a more forward angle such that ahead stem wouldn't be necessary (see Dahon or Brompton).
The ahead set does not seem to stick out much, as the stem actually angles under the bike when folded. My H bars do stick out a bit, though.
4) can you comment on the ride, in comparison to your other bikes (NWT, Joey)?
The ride is fantastic, it feels as comfortable as the NWT, though maybe not quite as stiff as the Joey. It is a softer ride than the Joey, though, for this very reason. Longest continuous ride so far has been 40km. I think I could easily do 100 in comfort.
5)How does the folding speed and size compare?
Fastest fold in the world, hands down. No problem folding and unfolding several times a day, no hassles here. The size is manageable, though not the smallest.
6) uniform rear triangle constructions get a lot of force on their rear hinge. Do you notice any flex or play when stand and crank? What kind of bearings to they put there? I am a bit skeptical as other URT bikes have massive hinges, e.g., Airnimal Chameleon.
Have not noticed any rear triangle flex when pumping up hills, nor have I heard of any Tikits failing there. Any flex there may be would come from the stem.
7) does the disk brake help for taking front wheel off for suitcase fold? Or is it more problematic?
Just loosen the QR lever, and remove the tire. No need to touch the brakes at all, even easier than V brakes!