Pianoteq
Pretty amazing.

Is this another player/instrument, like Kontakt? Are there a host of 3rd party instruments that can use it, like Kontalt? If not, the PRO $ seems pretty steep, tho you do get 2 lesser $ choices, unlike Kontakt.

Pianoteq is a piano modeling VST. Comes with 3 grand piano models and you can buy additional acoustic & electric pianos among other instruments. Check it out: Pianoteq.com 
I have the Standard version. Takes very little disk space, like 30Mb or so, not too CPU hungry and sounds really, really good.  Check some YouTube videos.

I really like their low notes but could never get along with the midrange for more poppy playing, personally. Definitely worth checking out though and an interesting alternative to huge sample libraries.

Well....I'm more into guitars than piano, but I use their YC5 and it sits very well in my mixes.
But that's my ears talkin'.....

FWIW -- TruePianos goes for $120 at the moment. I bought mine so long ago that I don't know whether this is the current normal price or a sale.

And, yeah, it's pretty darn good, IMHO.
 

I have a lot of vst pianos. My most use one is pianoteq5 .

I'm a pianist by profession so by definition pretty nitpicky about the "feel" of any digital piano. Pianoteq sounds quite good and I've used it on demos. The bass notes in particular are amazing, that they did that with pure modeling. Much more "alive" than most sample libraries. I just never really got along with the midrange for anything but ballad style or classical playing. I suppose it must be like Fender purists playing a Blade strat (which I do own and love, haha).

I've got a number of piano libraries, and also the Arturia Piano V modeled piano, but I find that I always end up using EZ-Keys Grand or Upright when sketching out draft piano parts. Somehow it just feels good to me when I play it. It's not the best sound (but I'm not the best player!), but it just seems to sit well with other parts when I need a good all round piano. 
I'll often replace it later with a more subtle piano library, but it remains my go-to piano. For the price it's excellent, and if you're not the best piano player it does make it easy to put piano parts together using the inbuilt library of midi phrases. The midi pattern aspect is clever, but feels limited in what it can do if you want complex arrangements.
 
Alistair C.
 

Hi. I just bought Eighty Eight Ensemble for 16.99$
I think it is a very good deal, and a really nice piano(s) 
All the best.