last time when i was in a music shop i tried the keys on many keyboards, and i must say i felt disappointed by most. yamaha, casio, kawai, something was just off on most of them. i was very surprised by the fact that keybed on korg kross felt much better than the awful keys of korg krome, since the kross is supposed to be the worse model. both were 61 key versions. i actually pretty much enjoyed the keys on korg kross, i can't say they were the best, but it was the best out of the bunch, they didn't feel squishy, had some resistance to them, fast return. there wasn't a roland fa in there but there were a lot of other rolands, and they all felt disgusting, juno 61 was among them and i believe it has the same keybed as fa-06. yamaha psr s670 and s770 felt not as good as i expected. kawai pianos i didn't dig at all, would stay away from anything from kawai unless it has their top notch keys which can be found in their most expensive models which i didn't try. casio is most definitely worse than anything else. so, yeah... on the midi keyboards side... alesis v had the best feeling keys, very good resistance to them and the return is very fast, but unfortunately, i read it has poor velocity sensitivity, although didn't figure out in the end whether it's curable by software or not. really not much semi-weighted options on the market, tons of unweighted cheap keys, or very expensive hammer action (or at least somewhat expensive but most always not that good). myself i ordered a komplete kontrol a-series midi keyboard, hopefully keys will be to my liking, it is said they are semi weighted. i'd suggest you to try a korg kross in person in any shop if you want a workstation. if you only care about keys, i believe there were a few 88 midi keyboards with hammer action, like m-audio mk (which i am wary of) or studiologic sl88 (about which i'm not so wary of, but didn't test it in person). as i've learned, just the hammer action in itself doesn't mean the keybed is automatically good, as in case with the lower end kawai, they can feel pretty much disgusting. i suggest you try anything in person, because even if a lot of people tell you that some keyboard feels really nice, you yourself might completely hate it, so if you still decide to buy blindly, buy it from somewhere you can easily return it. peace.