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I have a pair of core cargos that I've had for about 18 months and a pair of 'regular' core bibs that are about a year old. I had another pair prior to that, which were also about a year old when I tore them to shreds in a crash. Have had no quality issues with them at all and (as far as I'm aware...) they haven't gone see-through on the bum, which seems to be a common complaint.
Warmth-wise, I would say they're on the warmer end of the spectrum of 'regular' bib shorts - they're relatively thick. Have worn them in <10c weather with leg warmers and my thighs and bum have survived.
However, I did just get a pair of Castelli Free Aero Race 4 shorts on Wiggle for £100 and they are noticeably better than the Rapha ones, for less money.
Edit: You asked about tights not shorts. Ignore half of what I said.
Any views on the quality and warmth of the Core bib tights (£110) compared to Le Col entry level or La Passione entry level both of which are a little more but? I'm not looking for deep winter warmth as I have the padless winter tights for then...