I had a Fatar MIDI keyboard for a while, had to return it because sometimes some sounds got frozen (as if I didn't release a key). It was a semi-weighted keyboard.

Can't say that I loved anything about that keyboard. The keys were fine, but overall quality seemed poor. The store told later that they would no longer sell it due to its low quality.

Later I played some PSR's, also played continuously a cheap old acoustic piano and a good Yamaha grand piano at restaurants, have got to say that PSR's keybed never seemed to me as a big problem. Of course it takes time to get adjusted, just like with new shoes, also, I think, we have to adjust our music to different instruments as well.