Seconded on the Yamaha Reface series [0], they are widely regarded as having the best mini keys on the market. One note on the velocity sensitivity, though - while they all have the same keys and send velocity data when used as a MIDI controller, the built-in sound engines on the YC and CS models don't actually use the velocity. Just something to keep in mind.
Anyway, they're quite portable, solid and well-made. It feels like a real piece of kit and not a cheap plastic toy synth. They're really ideal for a great-sounded keyboard that you can just sit down and play without needing anything else.
Unfortunately, they've been unavailable for months now on the retail market but you can find used ones on Reverb [1] for a modest markup over retail price (USD $400)
A budget options is the Yamaha PSS-A50 [2][3], which has the exact same keyboard as the Reface series, but it's definitely more of a plastic toy and the sounds are just okay. But you can still use it as a MIDI controller if that's all you're after and it's only USD $100 at MSRP.
Anyway, they're quite portable, solid and well-made. It feels like a real piece of kit and not a cheap plastic toy synth. They're really ideal for a great-sounded keyboard that you can just sit down and play without needing anything else.
Unfortunately, they've been unavailable for months now on the retail market but you can find used ones on Reverb [1] for a modest markup over retail price (USD $400)
A budget options is the Yamaha PSS-A50 [2][3], which has the exact same keyboard as the Reface series, but it's definitely more of a plastic toy and the sounds are just okay. But you can still use it as a MIDI controller if that's all you're after and it's only USD $100 at MSRP.
0: https://usa.yamaha.com/products/music_production/synthesizer...
1: https://reverb.com/marketplace?query=Yamaha%20Reface&make=ya...
2: https://usa.yamaha.com/news_events/2020/yamaha_pss-a50.html
3: https://reverb.com/p/yamaha-pss-a50-37-key-mini-keyboard