Can't find basic specs for the Rega. If you search wow and flutter with google, seems some speed issues. Don't think that to be a good sign...........................
On the other hand, it's one of the most successful, popular turntables of all time...due in great part to its tonearm (an engineering masterpiece). That would seem to be a good sign.
The Rega 3 series has been measured in the audio press many times. The Planar 3 Is probably the most forum-scrutinized turntable in existence. Its wow and flutter is in line with the competition.
http://clearaudio.de/_assets/_pdf/reviews/turntables_archive/blackmotion_hifichoice.pdfI do like their tonearms, they're well done but need a VTA adjustment.
I couldn't find specs anywhere using Google search, measured or published or anything. Can you provide link please?
I appreciate seeing that review and the testing they did on those different turntables, but the Rega they tested was the P3-24, not the older Planar 3 that the OP is considering. The new motor introduced in the P3-24 is available as an upgrade for older models, and is "guaranteed to improve drive, speed stability, and sonic performance." This implies that the older model will likely not match the newer one's wow and flutter specs. One of the reasons I think a comparative audition between the older Planar 3 and a new Planar 1 might be interesting is because the new Planar 1 also now gets a low vibration 24 V motor (the prior RP1 and P1 did not have this more advanced design).