Yeah, I have a pair and they are a bitch to release. Extremo's right about pressing on the back of the ratchet with your thumb while pulling of on the front- that's what's been working for me. I use the DLX/Flite ratchets- they're much easier to release than the others, as I have a pair of the Force ratchets and they can be difficult to work with.
All Union needs to do is put a friggin release lever on the toe ratchets like they have on the ankle ratchets. That would reduce their #1 complaint by a lot.
It's not complicated, if Union's reading this.