I absolutely love Clayboard Textured for watercolors. They are now calling it 'Aquaboard' I believe. It's the best thing I've used but I love the way that the paint goes on and stays on and also lifts the best. Just drown it with paint and then have fun.
It can also take a more traditional light glazing type of painting also. It does dry a lot faster at first. Once it gets wet then it will tend to stay wet. Keep an atomizer handy.
I think that the colors on it are prettier and brighter looking...especially when sprayed. There are many artists who are in love with this support and I am one of them.
Good luck with it.