This is the roller I have. I have a love/hate relationship with it. It hurts when I roll but I feel so much better once I'm done.
I found this article about where endurance athletes need to focus their rolling.
I'm not sure I'd call myself an endurance "athlete" - but I am doing endurance workouts so I figure this fits my needs. Personally the area I have the most pain is my Piriformis. In addition to my roller I also use a tennis ball for the areas I can't roll and "The Stick" on my calves and arches of my feet.
Last night my muscles hurt so bad in a few spots it was hard to fall asleep. Sad I love sleep! I'm trying to roll it out twice a day right now so that I don't get injured. I am NOT going to let myself get injured this year. I have too many races to do and too many miles to run!!
Today's workout: spin & weights
Tomorrow: 10 miles