Bought it before going to Yosemite a couple years back. The plan was to have it on my D7000 and the 18-105mm on my D90. I switched 1/2 day in as the reach is great, but the 28 just wasn't wide enough for what I wanted on a DX camera, and Yosemite is all about vistas.
Decent IQ, and no real complaints other than you have to lock the lens when you're carrying it around as it will creep to full zoom otherwize. Having better glass now I could poke at it, but it would be quibbling. I sold it to finance the D600, which was a bit of a mistake because it's really a great piece of FX, walk around, vacation glass. I could have taken the D600 and just that lens to FL this past week and not quibbled a bit (with the exception of 1 sunrise shot).
It works just fine on a DX camera, but you need something wider for walkaround and even most landscapes. I regret selling mine, but only for convenience sake. If you're looking for one lens to cover all that ground realize that it's not going to be as sharp as others, and the f/5.6 at full extension can cause focus hunting on some cameras as it gets dark.
In a sentence - great FX vacation lens, and "good enough" for most other uses.