User blog comment:Emptylord/Season 3 - PBE Patch Notes/@comment-4270771-20121121081421/@comment-5490997-20121121084625

It can only hit other targets, so in a 1v1 without minions or anything else nearby it only gives AS.

It also doesn't proc all effects, for example Cait's passive and TF's E stack faster with it, but the ghost bolts don't apply the extra damage those things give (which means again that it only helps if there are some other targets nearby, otherwise it gives you only AS).

Personally I won't say it's bad, but it's not going to be a must have for many champions. I've tried it a few times and to me it mostly just feels like a farming/pushing tool, which is pretty bad considering it costs so much.