I´m sitting here right now! I´ve been riding here since before it was a trail center and it´s great. Definitely worth a visit but don´t expect a trail center like in the UK. It´s not that, it´s wild trails which have been marked. The best routes depend on the weather and I don´t think there´s many bad ones. Best bet is to ask a local when you get here, or if we´re here we would steer you in the right direction.
We contract a local taxi for uplifts that our van can´t do but it doesn´t really work if you´re by yourself as it works out expensive. They might be able to match you in with a group if you´re lucky and it´s the weekend.
We don´t ride them according to the trial maps, we use vans and shuttles to mix and match the best bits and join multiple routes together into a day. We ride here a day and a half on our Backcountry Pyrenees trips and using the vans and shuttles you see lots of it in that time. I´d say if you are fit it´s worth doing the EWS trails, they are marked and you can ride them in 2 days. It´s around 4000m of climbing in 2 days so a bit tough. Asking in the local bike shop is a good idea, I´m guessing that you speak a bit of Spanish!