Now that I just crossed over 2000 mile with my Dahon Speed TR I think I know this bicycle a little better now and decided to give my impression of bike out
Quick background: I haven't bicycled for 2 decade+ before getting this bicycle. It was out of necessity due to my commuting situation. At start it was very low mile a day (4-5 miles). Now I am doing 30 miles a day.
Handling: Very nimble. Could feel unsteady at times until getting used to it but once up to speed, it doesn't matter much.
Ride: Quite supple and steady with stock big apple tire. With marathon scorcher, it is more nimble and gets a little harsher (still tolerable). I've gone up to 39mph on it and it still was stable enough.
Fit: I am 5'11" 190 lbs. The telescoping of handlebar does good job. Ergon grip on it is just great. Seat is... well, good. I found it getting on my sensitive area after about 30 minutes. I've swapped it with Selle Italia and it has been great. I don't feel cramped, etc. I do put my handle bar far out in front and low though. My arm reach is rather long so I would assume people who are up to 6'1-2" can be accomodated.
Drive Train: Pretty happy with dual drive in general. Overtime, I've gotten stronger and not really using the top and bottom of hub other than while bombing down the hill or starting from stop. Being able to shift while stopped is very nice indeed.
Utility: The rack is working out great. Wish it was Traveller rack but still on fence on that one. Mudguard is definitely wonderful to have. Seatpost pump while I only had to use it once was nice. Front generator hub is working me a treat. The light it comes with however can't really be said as to see light as it is marginal at best beyond 10mph.
Some modification I've done on it over time:
Swap tire to Greenspeed Scorcher: It is peppier and less comfortable. I did gain a little speed here but more so than that, I think it is more puncture resistant than big apple. Was happy with Big apple anyways.
Swap Saddle to Selle Italia Flow SL: For me improvement in comfort over long time ride.
Swap original dyno light to SuperNova E3: Incomparable. I am comfy with this going at 20mph. Beyond that... well... fortunately, those area are lit rather well.
Powergrip Pedal Strap thing: While the original pedal looks to be of high quality... it just didn't have grip. I was sliding all over with it. I tried toeclip and moved to Powergrip. Both of them works good but just for selection of shoes I have powergrip is better.
Now to... not so happy or things I just noticed:
1) Chain lasted only about 1600 miles: It didn't break or anything but it was more than .75 and less than 1. I would think they would last a little longer. Easy enough to replace.
2) Chain ring guard: Bad Bad design. The plastic isn't that sturdy. Add to it, the places where it joins chain ring (yes chain ring), have no additional support and actually is thinner than other parts of guard. I have superglued one and used different washer AND nut, and I just have another one cracked up there. I am probably going to fabricate something a little more reliable up.
3) Seatpost pump stopped working on me: Thor (brakemeister) sent me replacement promptly though. Thank you!
4) Handlebar post plastic piece started cracking: Thor sent me replacement promptly. Thank you!
5) I am not sure if I had not so well lubed dual drive hub but around 1000 miles, it started making noise and wouldn't shift well. I actually disassembled it and relubed. It is working fine after that. I think it is just one off case.
6) Pedal: about 200 miles ago, it started making wierd noise. I just opened it up yesterday to find that bearing was lacking grease a little and foreign material got in from crankside of bearing (dustcap side was fine). I throughly cleaned and relubed and today morning it seemed to be fine. I gave it enough grease so contaminant can't get through that side next time...
7) Bottom bracket: about 100 miles ago, it started making noise. It was gritty and seems like bearing was both loose and gritty (sealed bearing). I've replaced it with Shimano UN54 and all is well.
So other than some maintenance I had to do, etc, it has been very reliable and enjoyable ride. Basically, I've been saving up and have enough to buy new bike that might suit me a little better but haven't pulled trigger as this fits my need extremely well