Supposed to be the next step to the bt23's and yet in my experience had less grip and didn't last as many miles!
Just had PR2s fitted to replace the crappy Bridgestones, but they were old BT021s. The PR2s are still my tyre of choice - the transformation from the BTs is transcendent. But it's all about what suits you as a rider really, and only you can decide that, beyond avoiding buying tyres that
everybody slates.
Adding to what stiggy says, when I got the PRs fitted the other day, the chap that did them mentioned that the BT023s were good. I said that the T30s were meant to be a nice tyre too, and he said that people who use them tend to go back to the 23s after, in his experience, and he's rated as a very knowledgeable fella in these 'ere parts.
I tend to get about 6k miles out of a rear PR2, and that's all pleasure riding, so not hanging about. In summer, I get about the same from a front.
Oh, and the PR2s I just had supplied and fitted, on the bike, all in, £201, which I thought was pretty good for a tyre of choice.