Saw this @ safeway on tues. I asked the greens person about it, and she told me to take it home for free, try it and let her know how I liked it. I thought that was awesome, cuz I think it was marked at $5 which is a bit much for a strange fruit. She also retorted "alien brains" when I asked about the flesh; so yeah, definitely intriguing!
My impression of the taste is kiwi/lime, it is kinda slimy and the seeds are soft so it goes down easy. I would pay for one. Also a lovely photographic subject!