Allow me to chime in...
I bought a Liano, just to know how it feels. And it's cheap as chips. Up till now, I was using a Kawai ES110 to play piano virtual instruments and recording in Cubase. Very good weighted action, the ES110, but somewhat noisy for a small home studio.
The actions D1, B2 and B2N that
@Biggles is talking about, I know too.
I used to own a Korg Kross 2 88, which has the Korg NH (Natural Hammer) action. Not the best, but comparable to the GHS in the Yamaha P125/121. Which is better, the GHS or the NH, that's purely subjective.
The RH3 in the D1, well, one word, wonderful.
The B2N has a 'light touch' action, not weighted like a hammer action (like the NH) but I guess semi-weighted, AND it is graded ; I haven't played this action, so cannot comment.
I have played the LS action, though, and the one in the Liano is the same LS action that was in the Kronos LS. Not graded, semi-weighted but surprisingly nice to play for piano. For allround playing, it's really good, quiet action, too. For my home studio, couldn't be happier. More importantly, playing into the keys (or close to the fallboard) is dead easy with this, no extra effort needed.
If this were a hammer action, you'd only find this in the more high-end actions, like Kawai's GFIII or Roland's PHA50. This isn't hammer action, and it also not graded, but you can play some pretty advanced stuff on this. You only lose out on that true piano feel...
The sounds are quite good (supposedly they come from Nautilus), especially at this price point. But I use VST's anyway. It feels more like a good quality synth action at first, but it grows on you. If you're looking for a good allround action, go for it.
Unless you really, absolutely have to have a graded hammer action...
You obviously haven't heard any piano sounds from the SV2 or Nautilus, nor tried the keybed...