@billstevenson got your private message, but cannot reply to it as I don't want to put payment info into AG.
Re Rega Naia & Aphelion II, had it for about a year. Previous TT was a VPI Superprime scout with a SoundSmith Zephyr MIMC* cart and an Ortofon 2M black. [Before that a Thorens POS, let's not talk about that. Before that a Project 6.1. RIP.] Still use it with an EAT eglow petite, that should be upgraded. Also use a Zesto SUT, which made the overall sound fuller, more meaty, added more body. I use intermediate gain on SUT as well as PS, and give a bit more preamp volume to tune the sound to my liking on my system and room. Gainstaging makes a significant difference to me. Will go to Vienna in a couple of weeks to look around at HiEnd show.
Immediately noticed tighter bass on the Naia&Aphelion, and overall crisper, more detailed sound. I have no idea whether that is due to TT or cart or both. I have not mounted either the SS or the 2M black on it. For rest of my system, see virtual system on AG. I like the bare bones design, compact package. I was concerned about lack of torque on belt drive, but no issues at all with the three belt approach.
Dislikes: no adjustable feet, cannot be upgraded to TNG spinner feet because the feet are firmly glued? into the CF/foam base. Made my own leveling base (see virtual system). Actually have to switch out the spike feet to TNG spinner feet that I have sitting around. Was too busy finishing my latest book over last six months. Just reviewed soft proofs today :-)
Felt mat sticks to records, replaced with leather mat from Wooden Bull, based on The Joy of Vinyl YouTube recommendation. Is much thicker, so VTA will be different. However, I cannot tell the difference in sound between thin felt and thick leather mat. Also never heard a difference when fiddling with VTA on the fly on the VPI, so am dismissing that "feature".
Have you read Ghandi's Book on Rega? Explains a lot about his philosophy including not worrying too much about VTA.
When selecting my new TT, I was first looking at heavier designs, like bigger VPI, Michell Gyrodec, some German M....., also re dual arm set-up. In reality, I am more of a music fan than a gear head. So get something decent, then set and forget it. Eventually, the ultralight&rigid design made sense to me, and the Naia is the top of the line in that philosophy. Just went for it [auditioning TTs is impossible these days], as there is no option to upgrade anymore. And for top of the line, it is relatively cheap.
I listen to darkwave, new wave, cold wave, synth pop, EBM, electronica, some industrial, neofolk, weird avant garde stuff (Ece Canli, Laibach) on vinyl.