Are you actually going to
race on them, or do you actually mean the odd sportive? If you are, then what sort of races? Personally I'd have no problem using them as entry level race wheels in a 3/4th cat crit where there's a reasonable chance of crashing, and your wheels might be toast. At £99, they're virtually disposable as that's almost the cost of having a wheel rebuilt. Why not try your RS10's at first and see if you like racing? If you do get into it, then you'll probably find a way to justify spending much more than £99!
As to whether they're better than RS10's - if you mean will they make you go faster, then the answer is probably not. I know a guy who splashed out on a pair of
Corima Winiums for the local Tuesday night crits in an effort to stay with the bunch. He admitted that it made absolutely no difference, and he regretted his purchase.
My model Bs come in at 1650g, but I wouldn't get too hung up on a 100g difference here or there. Still, it's nice to have more than one set of wheels, shod with different tyres to suit what kind of ride you intend doing that day.
Why not just buy a pair and stick em on
eBay if you don't like? I can't see you losing that much.