All the ones I've come across have had an inferior build quality, thin metal parts and the cheap, pattern Honda engine.
It's an unfortunate fact of life, you get what you pay for, and I'm sure that these machines will last well for a few years, but I'm equally sure that they won't be around as long as some of the other machines we see mentioned on here all the time (Honda-Merry Tiller-Norlet-Flymo, and so on)
I'm very sure that parts replacement will be a major issue in only a few years down the line, that's ok if it's just a belt you need, most motor factors will have something that might fit, but should you bend or snap the thinner blades or the thin metal handles, what then?
The allotments that I am on, bought off the Internet a M.T.D rotovator, that seems to be pretty good value for money, and the company has been around for a long time.
I would hate to see anyone dissapointed by spending a few hundred pounds on a machine that won't last all that long, it seems to me that it would make better economic sense to hire a decent machine for the couple of times a year they would use it ( my Merry Tiller sits at work for 363 days a year )
I'm very sure that there will be many, many people that have bought these cheap Chinese machines and are, at present, very happy with them. I only hope that that will still be the case if they need to get a major part for it in a few years time.
This is of course just my opinion, I repair horticultural machines all week, and as a mechanic, I naturally always look on the bleak side of any machine I see. It has been known for my workmate and I to get moved on from stands at trade shows when we get into full " that'll snap off, and that'll break, and that bit won't last long if our lot got hold of it" mode.