I think it would absolutely be great for the classroom! I've only ever used it with my two kids, but I don't see why it couldn't be shared among 6 or more kids. We use it mostly for math facts and it is very easy to tailor it to your needs. My son is in second grade and my daughter is in 5th. We use it with multiplication (in our own way) and it's a nice quick/easy way to refresh her and prepare my son.
It would be great in a classroom. It would be easy to put the children into teams and let them work together, or use it as a classroom challenge, or for extra-credit added to homework. There is almost no end to the possibilities if you spend a few minutes "day-dreaming." Plus, the dice are a good size for younger children (they are larger than regular dice.) You could easily ignore the "gameboard" (the fabric rectangle included with the game) and modify the game to fit your classroom/time/needs.
I have used it in my second grade classroom...with the entire class. I choose someone to roll the dice and post the numbers on the board. Then volunteers come up and write their equations. It works with all levels, because the lower kids are doing simple equations (2+2=4) while my high kids like to see if they can use all 5 of the numbers on the colored dice to hit the target number (2+3-1+2-2=4). To use it with the whole class, we just disregard the gameboard and see how many different equations we can find.
If your students know their facts well, yes. They have to know various ways to make a particular "sum" with the dice they have rolled. You could certainly modify the game using 2 or 3 dice and just have them add or subtract the numbers they roll.
It's more of a competitive game kind of like Boggle, except you have to be the first to use your dice to reach the sum on the white die ( die? dye?) does that make since?
It's great for a classroom. It's a two player game, so you could get multiple copies or find a way for kids to work in groups. You can also easily extend the game by creating your own versions of the rules.
I think it would be a great addition to the classroom. Lots of modifications are possible, including multiplication. The dice are also nicely nicely sized and could be used in other games. Also, with several sets, maybe with groups of 4 kids each, you could easily adapt the level of difficulty to allow different ability levels, each with a challenge appropriate to their skill base.