Went from Madrid to Valencia for the Villareal game last year and the AVE hit 300km/h.
It was so smooth, never even felt like we were moving. Journey took 90 mins. In terms of the trains themselves, they are comfortable with services including a cafeteria, music on individual systems for each passenger (earphones are provided), films screened in each carriage (you will also use the headphones for this).
Been on the old TGV from Nice - Paris years ago and that was good, but the Spanish one is different class. Booked it in advance, cost about €25.