Small and Cute, If a Bit Expensive
Pictured: a Nuphy Air60 with a typical 104-key keyboard above it for scale.
TL; DR I enjoy typing on this keyboard, but there are other compelling options in the low-profile mechanical keyboard market. It really needs QMK support (at the same price-point) to be a hands-down recommendation.
Noise: My board has linear red switches, but it's still noticeably louder than a membrane keyboard. However, I doubt it'd be loud enough to annoy people sitting nearby at, say, a coffee shop. There's no sound-dampening foam/silicone above or below the PCB, but fortunately it doesn't sound too hollow or pingy as-is.
I haven't tested my typing accuracy compared to my laptop keyboard (a Thinkpad T480), though I don't notice any *obvious* problems. Possibly if you're a heavy right-Shift user, you might have some issues acclimatising to the 1U-sized key.
I bought this to be a wireless keyboard for controlling my HTPC from the couch, and as a compact, lightweight keyboard I could use with my phone while out and about. It's excellent for both use cases, though a split keyboard would be even more portable. Even though only the top part of the case is aluminium, the keyboard shows no flex even when typing on an uneven surface (e.g. my lap). Standby battery life is excellent -- I've been using it for brief typing sessions for a few months now and never had to worry about recharging it.
I couldn't care less about RGB backlighting, especially since the included keycaps aren't shine-through, but at…