I sampled my first sumo citrus today. They are very large, 6 weighed in at 6 pounds for $24. Pricey! Probably won't buy any more.
Peeled easily. Not a lot of stringy stuff separating the sections like some mandarins. Moderately juicy, sweet with some tartness. The first one had no seeds, however I'll plant any I find.
But like all California fruit sold in grocery stores, nothing to brag about. I wouldn't say it was any better than the sugar belle from Florida I tasted in Seattle last week. I sent my parents a box of sugar belles around Christmas and they saved one for me to try.
I found one small seed in 5 fruits. One more to go. These fruits really aren't very juicy.