My take on Chinese amps is that they are basically kits of parts,
nominally put together in working condition. They're worth it for the
parts - if they are cheap enough after importing. This suits a
competent builder, who can immediately start replacing parts and who
can fault find reasonably well. Something like the equivalent of an un-
reconditioned old Leak amp with leaky caps and out of spec resistors.

But add on the import duty and this comes to over ?700. This buys a
better valve amp on the second-hand market. Like a re-conditioned Leak
for instance. Better? Well, I'd prefer a 300b. But a Leak will hold
its value, is substantially built and can be tweaked to sound really
nice. But there are quite a variety of valve amps about these days,
and I wouldn't be surprised if ?700 would get you a nice Yank amp or a
boutique UK one.