Hola Jaime
I did my FI (R) at EFT in Florida last summer. The course was excellent and I learnt a lot. I realize how much now that I am instructing myself. It was hard work but fun. As for the validity of the course, all I can say is that I am presently working in Mallorca as a flight instructor and have had no problems whatsoever. E-mail me if you need any specific info. that I might be able to help you with.
Un saludo.