Yea they are quite variable but they can be quite excellent quality.
Other puerto rican varieties that I cant find any info on but are intriguing to me are one: Martinez, which Dr. Brunner says is one of the best quality cultivars.
Also Tuna and Cesar Ramos, which he says are great yielding cultivars.
I'd like to know how regular/productive is martinez, and maybe a quality description, and also how good quality are the productive varieties Tuna and Cesar Ramos.
Sasa is out of the consideration because from my account and from others it is shy/irregular bearing. It is the best in quality in imo.
The qualities I'm most interested in are how free stone it is, sweetness and pulp content, in that order.