Well.... I would say, from seeing and riding a Curtis T26 The build quality is second to none, it really is worth the money, unless you decide to sell it, which, if you do, you wont get anymore than £250. Iolo, I havent seen one of these in real life yet but I have not heard a bad thing about them, they're cheaper than the Curtis with roughly the same sort of build quality I would assume from everyones banter about them Overall, with the Curtis your paying for the brand and quite a few years experience, whereas, with the Iolo your getting a reasonably priced frame, that when you break, will be repaired free of charge (I think)