If you do a search for them here on BF, there are a lot of people not terribly happy with them - or at least the 550 wheelset - are these just 550 rims or the entire wheel? Lots of people have had problems with the wheels going out of true fairly quickly - which is to some extent happening to me too after 700 miles or so this autumn. This may be due to the factory spoke pattern on the rear wheel though. But I got a good price on them and they suit me for the level of racing that I do. They're not terribly stiff wheels though.

I'm maybe 80 kilos or so (don't actually know really) which I think comes out to like... what? 175 lbs?

Overall, I can't complain really. They're fine and the black ones look quite smart. The only major complaint I'd have is the cost of the spokes - like £3.50 each... I should be able to get a box of spokes for that. But if you're just getting the rims, I think I'd rate them as an unremarkable mid-low end aero rim that would suit winter training quite well.

I don't have any sense re: what just the rims would be worth...