OK, it arrived and here's a very brief review:
TL:DR - I like it
It arrived on a pallet, wrapped in black plastic. After taking the plastic off, it was apparent the machine was in component parts but everything well strapped down onto a small pallet. There were no instructions at all and the user manual doesn't contain assembly information but it's reasonably simple to put together.
Essentially, there is the main cutter unit, with a PTO shaft one side (and the gears) and another shaft the other side, for a flywheel.
All the metal is a heavy gauge and it seems well made. I'm not overly keen on the lack of spring washers or Nylocs on many of the fasteners, but we'll see how it fairs.
The flywheel was a bastard to fit. Fortunately, I have a tractor with a loader and winch hoist so I could lift the cutter unit up and also turn the machine onto its side to install the flywheel. Took me a couple of attempts to get it in place but I'm a little concerned that there is no central fixing bolt. It's on tight, though, and contained in a metal box. I'm sure if it works free, the noise will be horrendous.
Anyway. Got it assembled and attached to the tractor. PTO shaft was too long, which was a nuisance, but after a few minutes with the angle grinder, I got it all on. One complaint I'd seen in a YouTube video was that it is supposed to be greased every time you use it but that meant taking a whole panel off. They've now installed a grease nipple. I applied a liberal coating to the gears before fitting the panel, though.
Tried it first with some fairly thick (80mm+) branches, of birch, willow, oak and pine. It chomped through the lot with frightening efficiency. The logs are about the size of a drinks can. That was cut directly into a builder's bag.
Next, I put through some thinner, but dry willow. Again, no problem, and I now have a good supply of BBQ fuel.
I then fitted the bag holder and attached a net bag. Put some pallet bits through - didn't bother it, although they got a bit snagged on the bag. The unit sits fairly low to the ground so the bags can't fill very well but if I mush them up around the spout it might be better. The dry willow filled the bags with little issue.
I've noticed that once the outlet chute is blocked, the arisings just drop out of the bottom.
Next I tried it on a pile of pretty damp willow brash that's been lying in a pile for weeks. This blocked the chute quite a lot and I just let it all fall to the ground - should rot down fairly quickly. If I'd used a builder's bag, it would make for a very neat job. I'd imagine that bagged up and left to dry, it would make reasonable kindling.
I'll post pictures tomorrow when I have more time. Planning on putting some fresh cut willow through it tomorrow and maybe some tile battens that are full of nails
All in all, it's processed a load of smallish wood far quicker than I could with a chainsaw and has the convenience of going straight into a bag if required.