Thanks guys. I would be intending to use them for racing only and interesting to read that the Ben710, who recommends to stay away, posted from Germany. The wheels are advertised there and I guess the price reflects the reputation.
As usual .... you get what you pay for.
I'm leaning to the Oz Al wheels now .... seems like the best value for money in race terms. C/f would be wonderful but just too expensive for me plus I witnessed a buddies c/f rim get destroyed in a pretty innocuous race crash.
The sick feeling I/we get when we go down in a race and then bounce up to quickly asses damage is bad enough without having to worry about squillion dollar rims getting totalled.
Having said that, and touch wood, I've used Mg rims on my previous race bikes for years and never had a problem.