I searched the user you mentioned and read his impressions before I replied but didn't mention it because, big surprise, they didn't change anything. Okay, they were positive. There are other users in this very thread who like the Portal who say that they can't use it to play twitch games, even though I would have no problem playing a twitch game on my Wii U gamepad. Which is over a decade old. Somehow, my expectation that Sony might implement a similar solution for a dedicated use device, which largely came from Portal defenders on GAF months ago, is "imaginary".
It's a one-trick pony that struggles with the one trick. Yes, it still has utility if you really need that trick, but they could have should have done much better.
I've seen 120ms, and I've seen people who like it say it's bad for the wrong types of games. I've read about 25 posts. I think I've seen enough to form a picture of what's going on here. If I really missed something so megaton, show me please.