The keyboard itself, er, takes some getting used to. But they are a little cheaper.
https://en.wikipedia.org/wiki/ZX81#/media/File:Sinclair-ZX81...
So board #0 beat the stock price but only just. And I am comparing board 0 to any old apple 1.
Apple II was one of the early PC's that used a switching power supply, and it wasn't particularly reliable. I worked at an Apple repair facility, and we replaced a lot of them. But our most common repairs were due to the huge number of chip sockets and low quality gold fingers on the disk controller board edge connector. We were a government agency (county run facility serving a bunch of semi rural school districts) and didn't charge a bench fee. If we could fix it on the spot by just pressing all of the chips back into their sockets, the repair was free and we didn't even log it.
It's a thing that still shows up in a web search (but is far less meaningful).