To tell you the truth - i've never had one, but it seems to me, that all koxx frames are exetremely light and of very good quality, but the tube walls are very thin, so that when your tire slips and the concrete parapet hits your lower tube, you'll get a huge dent and after some time a crack.
As Gazza has written, we have very few Hydroxxes in Russia, so may be Observed trials is a better site for such questions.
P.s. sorry for my poor english
