
The Guess looks like reasonable value.
However, compare it with the Carrera Vanquish if you can. They are knocking them out for £489 now and for the money they are very good quality machines. Especially the frame which is triple butted 7005 and the wheels are very strong and lighter than Ksyrium Elite's. I would bet that the Guess is a tad heavier and less stiff then the Carrera.
Having spent the last 6 months racing on a Virago, if I needed another bike with a budget of <£500, I would go for the Vanquish.