I disagree strongly with the lousy seeting comfort, we rode it for 18.000km now, and it still rocks, the shock actually gets a bit soggy now, and build quality is a little off perfect, but the sheer fun of the little bratbike compensates for the little nigles.
The fuelling is a little off the beat at slow speeds, once ont the free road it's a real joy, we rode it to its actory near Barcelona, sure a langer ride than the afore mentioned quarter of an hour :-)
A complete ride report is to be found here:
http://www.sylviastuurman.eu/motor/derbiride/