Questions about folding bikes..can anyone help?

for those of you who have them: do you think they are comfortable to ride on? are they stable? do you think they are good quality bikes (at least decent)? it might sound stupid but my biggest fear is that my bike will split up in the middle of the ride...or that i'll have to fix them a lot. i wanted to... show more for those of you who have them:
do you think they are comfortable to ride on?
are they stable?
do you think they are good quality bikes (at least decent)?

it might sound stupid but my biggest fear is that my bike will split up in the middle of the ride...or that i'll have to fix them a lot. i wanted to buy a bike but i now live in a small apartment so i need something practical.

i have a few bikes that i found:
1) DAHON ECO C6 -
2) DAHON ECO C7
3) DAHON VITESSE D7
opinions?

thanks!!
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