I have one of the rip offs but I would say it is a not too bad rip off. It is the Travor grip which is very similar is looks and features to the Pentax grip but most likely not quite as weather and water resistant; which makes little difference to me.
It has the, well here let me show you:
Battery Grip for Pentax K10D K20D replace D-BG2 - eBay (item 220360423041 end time Mar-13-09 18:40:58 PDT)
It's not bad. I do not have the Pentax remote. When I see my cousin next time I will see if the smaller Pentax F remote fits in the compartment. I do have the "ultimate emergency SD card" stash in that compartment just for the sake of seeing if it fits well. And I often to accidentally illuminate the top lcd screen when moving my hand and pushing the respective button.
And from what I understand, I select "grip" first for the power supply so yesterday when the battery ran out, the camera shut off of course so I turn it off for few seconds, then turned it back on and selected "body" to continue shooting off that second battery. What I am saying is that perhaps with this grip, if you select grip first on the camera, it will run from the battery in the grip until it depletes and shuts off. You then have the option of continuing using power from the body of changing the grip battery. Either way I do not suppose it will make it easy for you to drain both batteries without notice. I wonder if you select the "auto" function and use the Pentax or other grips if you get this type of warning. Anyone?