I did my flighttraining in Spain completely. Have been flying 320s now for a few years.
There are many dodgy schools around. However there are also a number of very good schools.
The good ones:
FTE Jerez
AeroMadrid
Adventia, Salamanca
Stay clear of the other ones!
I also had a Spanish JAA CPL once. It's no problem converting it to a Dutch, UK or whatever JAA license. I did both. JAA is JAA.