fpd: I've been (sorely) disappointed with the grip on the Cadences. I noticed a few times they didn't give as much traction as I would expect from other Brooks shoes. In particular I had noticed a lack of traction going around some corners when damp.
Unfortunately for myself I ignored the warning signs and wore them to do some reps on the road with my club. End result being I slipped on a manhole cover (on a corner), and had a lengthy trip to A&E for X-rays etc and a stonking black eye for a few weeks.
I no longer wear them for any sort of speed work. I personally can't recommend them, especially if you've had problems with the related Flows. They are good trainers, and are suitable for some, but I suspect it depends on your individual running gait.