They are super rich. The F#2 is milder than many of the others. That combined with the fact that it's a smaller fruit makes it (the F#2) easier to eat. It's pretty hard to get through a 1+ pound trompo in a single sitting. But a 6 ounch F#2 is easy.
Fitzpatrick is a dry canistel. But it's really small, so they are not as hard to eat as, say, a dry bruce. My wife really likes them though.
Ross is the only other canistel I'd plant other than fairchild #2.
Ultimately the canistel isn't a fruit that's gonna cause the eater to go into an additive planting spree, nor is there any risk of it beating a taste match against a mango or a mamey. But it's a great fruit that produces reliably at least once and usually twice a year with high nutrient content to boot. It's a great addition to a home orchard. I might just stick to the fairchild #2 or ross.