PSE Studio 4 amplifier - any good?

I have owned two of these in the past and would give anything to have them back...used with a pair of KEF 102 monitors and you have sonic excellence if not Nirvanna...why they stopped being made is beyond me...use them with their comparable preamp if you can

I am currently using the Studio IV and still have the Studio V's which I bought several years ago. The monoblock Studio V's have a bit more 'heft' and bass as you would expect, but the IV has, perhaps, a bit more focus, though I haven't done a lot of back and forth comparisons.
I was auditioning a number of used amps for a second system and the Studio IV was far and away the best I had heard in the $500-700 price range. At the moment it remains in my main system as I focus on other upgrades.

I have a PSE Studio 2 amp. When I recently purchased this used I was not expecting nor prepared for the excellent sonics this amp produced. In fact it sounded better than many new solid state amps I have heard. It presentation is slightly warm with rich harmonics along with a large soundstage. Like many quality amps its sound steadily improved over a 24 hour period.