Different types have differing levels of adherence to seed or worse, the testa simply sticks to the flesh but comes easily away from the seeds, making the whole experience rather wooden. I have had one or two good ones up north that have come close to a crisp lychee, but in general, especially when shipped, they are just a bland, crisp fleshed fruit that vaguely resembles lychee crossed with cardboard. They don't have the flavor that longan does and I wouldn't compare them at all.