I do them all the time, great glute exercise. With the bar across your back you're going to feel a hell of a huge lower back pump after the first set.........if you're on dbol or such you might best skip this exercise. I also do them holding DB's but I don't allow my arms to swing so that I build momentum and take away from the reason I'm doing them, for the legs. When using DB's I use sraps because my grip starts to give out towards the end of the set holding upwards of a hundred pounds in each hand.
Combine these with lunges, your choice as to which, and you'll not sit easily on the ole crapper the following morning....and a couple of days following, if you did them right.