I don't feel that I can claim the rep if I didn't finish it. I did try the inverse partials once after seeing someone doing them. It felt wrong not to lock out the rep and, since I couldn't see that I would get any benefit from not locking out, I never tried them again.
I remember when I was first setting up my home gym. For a few weeks the only equipment I had was bar, weights and a squat stand. I ended up doing floor presses with a pile of weights on either side to support the bar. They were new weights and the pile kept slipping around as I lowered onto them at the end of each set. It was a big relief to get the power rack.