There's a chap selling used Numatics of similar size on eBay for less than half that price.
British made, spares readily available, glass-filled plastic tank (tough and unlikely ever to leak), and relatively quiet. If you really need something like that, I'd go that route, rather than something Chinese which you'd probably have to throw away when something on it broke.
We're lucky here: there's a Numatic agent literally at the end of the road, and he keeps lots of spares, but I'm pretty certain Numatic also do mail order if you need anything. But there's hardly anything to break: the motors are almost bomb proof, the switches are standard (RS Components?), you can fit new power cables easily - that doesn't leave much!
That said, I took a punt on a 60-quid Parkside one from Lidl recently (with a power tool outlet), and so far it's been really good. I have some difficulty getting the correct size bags for it (other than from Germany), but even that has a workaround. But unlike those big things, it blows and sucks, and has a PTO, so is more generally useful (haven't actually needed the wet function).
E.
