Overpriced (>$140), under powered (1GHz single core RISCV CPU, 1 GiB DDR RAM). Whats not to like? Take a look at the StarFive 2 SBC, full disclosure the only relationship I have with StarFive is that I bought one. 4 core 1.5 Ghz RISCV CPU, 2 GiB/4 GiB/8 GiB versions with the 8 GiB version going for ~ $100. Close enough to the Pi 4, if you can find one at anywhere near retail price, to be a REAL competitor with a RISCV processor.

I have an original TinkerBoard in a box somewhere. I could never get it to consistently run in a stable manner. It would be fine for a few hours to a few days and then randomly wedge. Or sometimes it would spontaneously reboot. I tried a few different power supplies, SD cards, etc. to no avail. It's likely to wind up in the "e-waste" bin the next time I do a cleanup of my junk box(es) in my office.

So not particularly confidence inspiring along with a completely new architecture.