I've had EHX Micro POG for a few years. I mainly use it for organ/synthy sounds and for that its great. The newest version is even smaller too. Simon has the full size POG which does loads of clever things, but is really pricey.
Not used the Pitch Fork, but the TC Electronics Sub n Up does loads of things for very little money. It can do the traditional Octave thing but it has a polyphonic mode too. Worth a look.
Hmmmmmm interesting. Never heard of that one during my searches.
I reckon a few of the settings on the pitch fork would never get touched, but I like the pitch shifting you could do with the latch turned on (or off). If I'm in belfast this weekend I might check out matchetts for the fucking craic.