The things that stand out, are the fact it's made from MDF, and it uses v-bearings running on angle iron. Neither of which are likely to create a reliable machine that doesn't require regular tweaking to keep running well.

Chain drive wouldn't really bother me, other than it's going to attract a lot of dust.

I'd also guess at the rapid speeds they're claiming, it will never actually reach them, or it'll shake itself apart with the accelerations involved.