I would ask your dealer if you can borrow a set of QPlus supports to try before buying. Quadraspire do a sort of boxed-set of the various supports so you can try out different options. You really have to do this because supports are notoriously subjective.
For instance, I had great success with Isoacoustics GAIA supports for speakers - very impressive. I liked them so much I tried their Orea supports for components - I tried them under a Bartok and a pre-amp. Didn’t like the effect at all - flattened and squashed the sound. But some people seem to like them.
I’ve also tried some Stillpoints, again a lot of people seem to like these. I found they simply made the sound too bright and edgy.
For me a point in favour of the QPlus supports is that they are designed to fit under the existing component feet. I personally feel uncomfortable placing support footers directly under a component by-passing the existing feet. The problem is you’re doing something the designer(s) of the equipment weren’t expecting - the result is going to be unpredictable. And I would guess, largely a matter of taste rather than an improvement per say.
I have a Quadraspire rack and the QPlus Reference supports under a Rossini APEX (that replaced the Bartok) and the pre-amp. They enhance the sense of alive-ness, without tipping over the edge like Stillpoints. They are very expensive though (the bronze does look gorgeous), only you can decide if they are cost-effective.