Astro A40s are probably the best headset I've ever owned. The sound is clear, loud if you wish, and easily controlled with the mixamp that can come with it.
Now I've owned Trittons, as well as Turtlebeaches, and I can honestly say that the Astros are the only headset that hasn't made my ears hurt from wearing them hours at a time.
Are Astro A40s for you?
As much as I love them, they aren't for everyone. If you plan to play hour upon hour at a time and/or are very competitive, then yes, a must buy. If you're just the casual gamer, then no, you probably shouldnt invest in them.
Astro A40s are pricey, but amazing overall. I give them a 4 1/2 stars out of 5.