That prospot does look interesting, but I can't find very many good pictures of it.
Anyone have a good link, maybe with a video?
The cheapest I found was $1100, which is more expensive than a high quality power rack, and I don't know how high quality the prospot is (as far as being overly strong for heavy weights and having more holes like elitefts sells).
The other thing I was thinking about was that a power rack can be just as safe as this prospot if you set the pins correctly, even for benching.
I can set pins so that I can touch my chest with the bar, but still 'deflate' my chest and set the bar on the pins and safely get out from underneath it. Same with squats.
I think when I finally start making my home gym, I'm going to go with a power rack, but I'd still like to check out the prospot some more.