Green Potions Working as Intended?

IIRC, the green pot lets you break the attack speed cap. If someone can confirm that, I would greatly appreciate it. However, I also remember that the green pots were broken in GMS, at least a couple months ago when MPE was first removed, and they actually didn't grant any attack speed at all. I've been reluctant to use the ones I've been farming, as wasting even one would suck. I'm sure it's been fixed by now, but I'm a skeptic.

It's because they didn't work at all when released that they did a quick fix and made it work in all situations (aka breaking cap).