I bought my D5100 in October 2012 and while I've had pretty good results with the kit lens, I've been wanting to move beyond the basics. So I rented a Tokina 11-16mm f2.6 that I've been lusting after and it arrived this afternoon. I've got it for five days and I plan to use it a lot this weekend.
I can't speak to the image quality yet but:
1) It's almost comically heavy. It makes one realize how cheap and plasticky the kit Nikkor lens is.
2) I love the focal length. Most of what I shoot around here is landscapes so I'm really loving the 11mm side of the lens.
The rental wasn't too crazy: $73, shipping both ways and optional damage waiver included, five days. A brand new version of this lens sells for around $560 so this is a nice way to see if I really want to buy it.
I'll be posting some photos as the mood strikes.
tell me more about this lense rental thing.