Hi jeffh! Can help you here, my company starting importing these a around 2010 for a couple of years here in the UK so I'll give you my experience

We only really had 1.5 to 3.5t gas and diesel. Quality I found very poor, pins, bearings ect.. made of cheese, mast rollers lasted 6mths to a year, Nissan k25 and yanmar 4tne98 engines used to suffer cracked heads and seized bores due to poor quality cooling systems, radiators were a joke - Japanese engine don't mean nothing and is going to die fast if its life support systems are junk. Transmissions clutch packs could last less then 500hrs (that's not a typo) if used for any real gradient work or harsh operators, also clutch packs were burnt out due to badly designed inching spools - the spool/main valve had no damper/accumulator set up to smooth clutch pack engagement - they just used a tiny pin hole port to slow oil flow and it worked until you had 1 tiny fleck of paint from inside the transmission case go for a swim and block that port and bingo, just enough pressure to engage drive but as soon as your drove it hard plates slipped and within 2 days the clutch packs were toast!
No real electrical trouble except direction levers falling to bits, front axle cap bolts shearing off.

Getting parts and warranty was a nightmare, parts were expensive, often unavailable, weeks not days if they were, on warranty China would try to make you to jump through so many hoops it weren't worth it. We ended up having to adapt parts from different trucks to keep them going (master cylinders from tcms, direction levers from doosans ect...).

Quality was just like any other no name Chinese truck, they were in my humble opinion junk! I still have some around that do OK, all in low useage in good flat yards with gentle opeartors.

New out the container - poor welds, not one bolt tight, cross threaded bolts, hose pulleys that don't line up with hoses, spent 2 days with another tech with 2 new ones tightening every bolt and replacing every fixed metal pipe on the masts because all were crushed when they just stacked one mast on top of another with no packing.

Most of the hydraulic hoses failed in short order, very difficult for hose companies to source the oddball fittings (bsp cones with metric threads if I remember) had to re-pipe a lot of em.

I could waffle about them all day, as a field service engineer they were the baine of my life for some time (while having to smile and tell the customer there new truck was lovely, not a pile of junk).

Any other questions just ask!