The boards are thin and the components are probably about as inexpensive as they can source. Plenty of surface mount components. But the build quality itself isn't really poor. It's standard Chinese fare. They are pretty much throw aways if they die after the warranty is up. But they dont cost much and I think you still get 3 years if you register the warranty. They are modular in that different boards are connected with ribbon cables. Which isnt unusual with Chinese amps. One component goes bad on a board, they probably replace the whole board when it's under warranty.
That aside, some of them sound good. That 1960 is one of them. I had a Bugera V22HD (head). The clean channel was great. Never had a lick of problems with it. I sold it. I have a Trirec Infinium that I bought from a neighbor kid for 300 bucks. It's a take on a Mesa but not really a clone (I own a Mesa Dual Rec.). The volume pot on the clean of the Trirec is scratchy when it's been sitting unused for a while but other than that, it hasn't had any problems either. I wouldn't have taken a chance on it at $700 but for the $300 I paid, no regrets. I'm more of a Marshall guy but it sounds good. I still plug into it every so often.
For $359 that 1960 isn't a whole lot of risk. Not too long ago there appeared to be a cult forming over those 1960's with people swapping transformers and probably doing other mods. I don't know if that's still a thing but they sound pretty good just as they are. Personally, I wouldn't put any money into modding one. I'd just enjoy it for what it is.