Having used a few foam rollers before this one's one of the better ones i've had. Being extra wide is a god send. I used to have one half the width and it's simply too hard to roll out the whole back. This one i can spread out and really get into the good spots.
The beast is good in that the uneven bumps on it do really sort out kinks in the muscles, downside of that is that it doesn't smoothly roll over the ground, because it's lumpy, it rolls lumpy too. So it's best used on carpet rather than timber floors as it gets more purchase on the carpet and tends to shift a little bit when on the timber floor.
It's also pretty firm, so if you're not one for a bit of enjoyable pain it might be too hard for you. I like it because whether its on the back, legs or even feet it really gets in there are you can roll the bejeezuz outta your knots and tight spots.
All in all its a cracking foam roller, highly recommended