And if you are, what are your experiences with them? I've been looking at this a bit, and can't quite decide whether it would truly help all that much (or at least whether it would justify the cost).

These are clearly pretty valuable tools, but also clearly pretty risky, as examples of them getting close, yet including significant issues, are fairly common. It's clear that accepting their choices is not good, so writing without understanding will result in bad and buggy code. Still, they do look like they would save a certain amount of time. It just looks like it would be mostly an improvement on Intellisense suggestions when it comes to VS.