Made my journey from Manhattan to Egger's, with thanks to those of you who offered information.
Overall, glad I went, but kind of disappointing. First, no one warned me that the ferry only leaves every half-hour. (Fun ride,though! Never did that in all my years here.) It ended up being something close to three hours in transit for 20 minutes of ice cream. Confusion and bad signage for the Staten Island buses at the terminal. However, the bus got me there perfectly, thanks.
Egger's had decor more like a coffee shop than an ice-cream parlor, but the big deal was the noise. And it was almost empty, too. There was mother with a screaming child, and I was daydreaming wistfully, wondering why restaurants don't ask parents to take their noisy children outside. But meanwhile, the staff was having a contentious argument about their schedules, and it carried so that not only could I hear it at my table in next room, but even in the bathroom with the door closed.
Now, about the ice cream. I went for a hot-fudge sundae. I had to ask the waitress three times to get her to clearify the toppping question. Prices fairly inexpensive, but portions small. They use metal dishes that are so cheaply lightweight that they slidearound while you try to get the spoon in. But here's problem: The hot fudge wasn't hot. Having spent all this time in transit, I felt it reasonable to point this out. The waitress didn't care. So I asked for the supposed manager, although he didn't look or act like the manager. For both of them, it was shrugged off, first their claiming the ice cream cooled it down, second - when I suggested they feel the temperature of the sauce not touching the ice cream to prove my point - it was shrugged off saying that it's the same as it always is. They were polite in asking if I wanted something else, but obviously that's what I came for. So I ate it anyway, annoyed. But, as further proof, the ice cream wasn't even melting.
However, as a nice bonus, I went to the bakery nearby, the Cake Chef's Cookie Jar. Now, that seemed great. I was going out that evening, so bought a box as a gift. Lovely patient staff, and at $10/pound, I think it was, a better price than in Manhattan.