FWIW, your PrimaLuna pre amp is an excellent pre-amp, as are many others. Whether it works for you depends on three things, 1) Your other equipment with which it must synergize: 2) Your physical set up including the room itself: and, 3) most importantly, your expectations, that is its tonality. It is neither a POS or SOTA. It is just another piece of equipment (tool) used to obtain a predetermined sound.
I would be happy to use your pre-amp as a key piece in my system but I would most probably have to use other equipment in my room with my speakers to achieve my sonic expectation.
Perhaps if you would take a moment to describe specifically what you are trying to improve or change in your present situation you would find folks willing to help you achieve that.
Without more information you really can't expect anyone to make intelligent comments.