I purchased a large non-stick skillet years ago that had a insert that held 6 nonstick cups for poached eggs. That's really the only need I've had for a cooker because fool-proof hard/soft-boiled eggs are a snap on the stove. I purchased a Braun cooker for one of my kids in college which was pretty effective but I doubt he used it more than once or twice.
I've had one of these gathering dust in the closet for years: http://www.amazon.com/Krups-230-70-Eg... . My parents got one for us and one for them, and I think they got more use out of theirs. As I recall, the results were a bit erratic. I've just found it easier to pull the right sized pot off the rack and heat water. I love gadgets, and maybe a different model might be of more use for you.