That's a Glute Ham Raise machine. Yes, it can be used for hypers but the proper flat section under the thighs/hips, on a hyper setup, focuses the movement more on the lower back and glutes, while this setup with the curved pads puts more pressure/activation on the hams.
http://www.poliquingroup.com/Articl...er_and_Stronger_with_the_Glute-Ham_Raise.aspx
A hyper setup is different and hits the back and glutes more:
…. but, as I said, if push comes to shove you can use the former to do the latter. There is also an angled version which makes the movement a little easier as half the movement is above parallel so less pressure on the top half….
As far as the barbell goes, vs a flat plate, the plate is much, much easier to pick up and place on the chest, especially for newbies and females (no misogyny intended) who may have problems getting it into position. You can see the guy in the vid in the previous post having a bit of a struggle getting a light bar in place. A plate would be much easier to pick up and hold on the upper chest, even a heavy 50kg plate, though most would be happy with a 10kg or 20kg plate.
Like dis:
Oh, wait, that's not right. Ahem. Cough. More like dis:
…. but, as I said, if you have always used a bar and are happy with the unstable setup, go for it. Just make sure you get them in at least once a week. I do mine after deads.