OK. After a little fight with Yan (!?), I finally got my downtube. My bike is in a good condition out of the box. I don't have much to say but here is some.
First, I noticed that it feel a little bit difference from normal bike when I'm turning. I think the reason is the small wheel. However, It don't take too long to get comfortable with. Actually, I felt that only on the first ride. Nothing different now.
Second, I was worry about the speed. I don't sure I say it right but what I mean is since the folding bike have smaller wheel, it will have less torque (more of your power go to the bike) but less speed (the circumference is smaller). However, the 8-speed that come with VII-FS can cover this. I want to say this because I think other newbies like me might worry about it. Yes, you can go as fast as you want, if you are not a serious cyclist.
The folded size is somehow bigger than I thought, and since there is no way to keep it folded (unless using something like a vacro). I cannot carry it to classes like I was planed. So, if you want to carry your folding bike around with you, I think 20" wheel can't really satisfied your need. I suggest to go for smaller one.
Last thing I want to say that I somehow can confirm the different look from people all around you. It's just a second day for me but I do feel people around me laught at me, no not in a negative way. I think it's more friendly.
I have a problem now. I can't find a kickstand for this bike. Any suggestion? (I don't do search yet at this time, but I'll before I ask again)
For Yan, I give him 90% satisfaction. I won't tell you what is the 10% missing . However, as far as I know now, I recommended downtube for someone who want to go to the world of folding bike.