I made the switch a while ago and love it. The image quality isn't night and day, I wouldn't have upgraded just for that, but the workflow is much better, especially with the customisable UI.
Everything can be moved around and re-ordered. Each individual tool just seems to work better. All the sliders are "milder" so subtle edits are easier. For a long time it had the (massive) advantage of layers, though adobe has caught up. Performance is better.
The thing I love most though, is a choice of using "sessions" or the main library. I use sessions for everything. They're basically mini self contained libraries. When you create one it makes subfolders for captures, selects, outputs etc. You're able to copy and move it around and take your edits with you, or send it to someone else.
Most importantly though, if a disk fails or whatever, you'll likely be able to recover 99% of the sessions whereas if your library gets corrupted, you're toast.
I definitely recommend it.
Also: Paul Reiffer has some good editing guide videos on youtube, where he really explains the nitty gritty of what each tool is doing behind the scenes and how you can use that knowledge.