I used to be a lot more of the opinion that reverb needed more work - but much has happened in that time. Now we can get a lot of traction from using 'tone' and balance between early reflections and tail of reverbs. Convolution reverb = arguably the "best" kind for realism - and it's an option inside Pianoteq - no need for a DAW for this - just find IR files online which measure real spaces and/or hardware equivs). For example, searching this forum for IR files will find a bunch of threads with links to good sources (it's as simple as downloading these and when in Pianoteq, choosing convolution reverb and loading one, like "Church-centre-aisle-omni.WAV or whatever you've downloaded from many collections around, many if not most for free).
The whole system feels more integral now - not to say I don't prefer all the nuance availed from some of my fav reverbs in a DAW - but still I think it's fair to say that reverbs in Pianoteq have quite come of age. There was a time where I didn't feel that way - but I'm beyond extra fussy with my reverb strategies in a DAW - and honestly, those are never going to be reproducible in any individual VSTi let alone in Pianoteq (gates and different diffuse layers/tracks with different widths and close blended subtly and so on).
But, having said that last para - when just sitting down to play Pianoteq, I don't need or want all that - that's post production to me in my usual use-case-scenarios.. and over time, I'm definitely coming to a view that I'd love improvements to reverbs - but I don't think Pianoteq needs to build that side of things in, unless more tied to the model perhaps (shootin' the breeze). For example, logically, a person using player perspective on speakers already has own room acoustics on top of whatever added reverb, and on headphones then reverb itself might be wanted for sweetening a little.. but in some ways, maybe reverb is incorrect here as the pinnacle item for re-creating an overall reality - and so again, I think much of this will end up as much a part of the engine, as engine+reverb.. again, time is going to tell how far and in which direction things travel. As it is, I couldn't be happier though with my options.
@Deyfidpetro - it's good to see your opinion I love to see how others are appreciating what's possible with Pianoteq. Like a broken record, for me, it's indispensable now.. and the only software piano I will work with (too many good reasons including increasingly realistic playability and pliability).
There's no limit to how I can make it sound in a DAW.. trying that with other sampled pianos, or even a nice recorded piano track is a brick wall learning moment. Being able to audition dozens of beautiful pianos for any MIDI performance - then being able to change anything about those pianos (using reality-based controls before getting into anything to do with post production).. limitless.
Re. U4 not sounding the way you want: all I can think is "Give it time, you will learn the controls".
Honestly - EQ (pre and post inside Pianoteq) just give a tilt to your bass in pre (main Equalizer button).. and maybe sculpt a little EQU3 mids.. sincerely hoping that helps you gain some body in your U4 presets. (I've posted a fair bit about EQing for different effects - hoping it helps Pianoteq users understand "body" or "attack" and all these things can be enhanced or cut with the controls before even thinking about a DAW).
For giving some body/depth to an attack which you hear as too brittle for instance, try moving the "energy" slider to the right (to something like 0.06). This is like stretching it - with still some recognition of physics in the model.. I do this little trick a lot - between 0.01 and 0.04 mostly.
Pianoteq Studio Bundle (Pro plus all instruments) - Kawai MP11 digital piano - Yamaha HS8 monitors