I was at a regional educational service center where they used Promethean, but I've mostly used Smartboard.

even though I have a Smartboard in my classroom I use ActivInspire and I'm Promethean certified.

I just got a Promethean board and am learning how to use it - I teach Algebra

Our district has a certified Promethean trainer as our technology support person. He's on my friend list. AndyTDSC.

All 6 teachers in our math department use Active Slates. Several teachers in our building have Promethean boards as well.