I researched this lens before buying it - scoured the net, trawled forums and then took the plunge. Awesome bokeh and razor sharp. Fabulous image quality.
If you can manual focus your lens, this is a no brainer. Just get it. Bang for buck there's not much better. You won't regret it. It's the chipped version, so will meter with the body of most Nikon dslr's. There is also a focus assist green light, with rangefinder option on newer dslr's. Focussing at f1.4 With the narrow depth of field can be tricky but rewarding!
If you can't manual focus, think twice. Then learn how! Or look at the AF compatible lenses.
Build quality is great, although a nikon lens cap would be better! Lovely focussing ring, also comes with plastic hood and cheap carrying case.
Only negatives: lens cap a bit flimsy; No AF (but hence the price!)