A bit more thoughts here now that I have some time.
The quality of both the PL and Cayin gear is pretty astounding for the money. I once owned the PL3/7 combo and currently have a Cayin A88. Over the long haul the PL gear wasn't so much my thing in terms of taste but you can't fault the quality in any way.
The A88 was just as perfectly built as the PL but the sound happened to suit me a bit better - faster and leaner. Probably this is due just to the choice of drivers tubes. The A88 now resides with my gf in her system. It represents such value, I would have a hard time selling it.
Turns out I also owned an Onix SP3. THAT little thing, if you can snag it at the sale price of $700, represents near-crazy value in terms of build and features. Stepped attenuator!! To my ears it didn't sound as good as the Cayin or the PL gear, though. Not quite as good. No major weak points, just an overall impression. I don't recall details as this was nearly a year ago now.