I’ve seen two come through my current barn, and several down south. All of them had lovely temperaments, stallions/geldings - didn’t matter. Lovely, sweet horses, darlings on the ground. One was kept intact as he is a breeding stallion. He is just fine to handle and impeccably behaved on the ground (and around mares). I could put my mother on him and he wouldn’t put a foot wrong. The others were gelded without a problem, including a 14 y/o.
There were a few that had lived their whole lives in stalls, and grass was a novel experience.
The training quality varied greatly, everything from push-button-perfect-PSG to oh-my-god-this-horse-is-unridable. Watch out for feet, I’ve seen a lot of stacked/crushed heels. Vetting standards are different, things that pass over there would not pass here.
There are some more very nice looking CDEs (Spanish Sport Horse) showing up - PRE/Warmblood crosses. Very athletic, more warmblood type gaits, very interesting horses. There are also some real donkeys out there - it’s not a guaranteed cross.
You should go and work with an agent that is recommended to you by people who have imported several times. Anyone can have one good or bad experience, better to have a range of data to make your decision. Bring your trainer. Ride the horses. Be absolutely up front and honest with the agent about your skills, your goals, and your must-haves/deal-breakers. No fun to waste time riding unsuitable horses, not all Spanish horses are created equal.
Importing is not a quick process - sometimes it takes a few months to get the horse on a flight.