I was pretty impressed by how well made the quest was. It was a bit on the short side (took me ~4 hours on release day, it'd probably only be 1-2 hours following a comprehensive guide) and somewhat lacking in the lore department, but that was kind of to be expected with how few devs were working on it.
As far as the drops go, even if you only get one rare every few hours or so, the gp/hr still averages out to be fairly high - though probably not as much as you'd get from Zulrah. I think the zenyte crystal is actually rising at the moment, but I'd expect all of the prices to drop significantly over time. If you're planning on camping the gorillas you should probably look to do that sooner rather than later.