I use the cones for Haste Potions. Mmmm, delicious. With haste gear, Heroism, Drums of Battle, dual Mongoose procs, DST proc, and a Haste Pot my weapon speed drops from 2.60 to 0.92 or lower. That 0.92 is the lowest I've seen but I'm not always staring at my character screen as I would like to stay alive in boss fights and stay out of the Rain of Fire/Death & Decay/Infernos/Whirlwinds/et al. I'm sure there's an add-on out there that will display my swing speed, I'll see if I can find one.
If you are not using Haste Potions, give it a shot. Like everything with haste it's important to stack lots of it. I'll see how low my weapon speed can go and report back.
Just a quick post today. I've decided to get a job, so off to do some job hunting.