Figfinatic,
The fruit of the seedless was not very sweet as they were not perfectly ripe.
They were mildly sweet and crunchy. It was quite good, but if I had left it on the plant for another week it would have been better. While trying to take a picture of the plant the tiny branch holding the two fruit snapped while moving the pot. I have since air layered the small branch(bud sport) hoping to make a plant of it to see if it will keep the seedless characteristic.
The mother plant produced sweet and flavorful fruit last year. This year the fruits are much bigger as I fertized them often. Now I have to wait till some ripen to perfection to see if the fertiliztion made a difference in the flavor and sweetness.
I did see the image of the Indonesian seedless in GW. The fruit reminds me of a baby Beluga whale. Check out the following video. It mentions the Indonesian seedless. That may be a source for it.
http://papayatreenursery.com/guava-tree-pruning-video/