I probably bought 1% of those sold
I got a 48k one when they came out. The keyboard was vastly better than the one on the Spectrum I had and about as good as a friend's Beeb. Somewhat to my surprise, and his annoyance, some of the then popular PCW benchmarks for BASIC ran faster on the Lynx too. Provided you were prepared to wait and didn't expect anything to move, you could do some nice displays on the screen.
But Camputers were soon forced to sticker over the 'RS-232' bit on the box, because it wasn't actually completely RS-232 compatible. If you used a TV, getting a stable picture was problematic because of how much resolution they tried to put on the screen. And the graphics speed was painfully slow: as everything was done as three giant (for the time) bit maps, this meant anything involving the screen involved manipulating three different sets of bits. It's a sign of how bad it was that a software scroll was technically possible, but would have been so embarrassingly slow, they didn't bother. You could type a command - 'TEXT', I think, and memory is telling me it was undocumented in the manual - which just used the green bit map, but the lack of a proper text mode meant it was unusable for writing on compared to the Beeb.
I got rid of the 48k when I got an Atari 800 - a superb bit of kit - but, argh, there were things I missed from the Lynx (the Atari had then unparalleled power for animated displays, but the Lynx's static graphics were better). When Camputers went under, the 96ks had a big price drop. Even so, I still remember the look of disbelief on the shop assistant's face when I asked for one, a Lynx junkie returning for a fix.
Some of the ROM issues had been fixed - although I think the serial port was still pointedly not labelled RS-232 - and it was a nice bit of kit, but... there really is no point in being the only kid on your block with one and when the Amstrad CPC6128 came out, I pounced. Adding a 5 1/4" drive was trivial and I had the machine that the Lynx wanted to be. It got bank switching right, it had a proper CP/M, and you could get a 80 column monitor.
I sold the Lynx on eBay a few years ago for about what I paid for it, albeit losing a big chunk because of inflation.
Had Camputers been properly capitalised, they could have used a ULA to cut the manufacturing cost (as someone else said, the insides were standard 74LS series chips) and competed better on price. But what killed it was the single slow bitmap graphics mode, because that doomed it in the critical games market.