For it's intended purpose, this blade is awesome. I use it to break down large sheets of (expensive) laminated plywood into smaller, more manageable sizes. For this purpose, the 40 tooth blade is amazing. Tear out is almost non existent; and that is without taping the cut or using a sacrificial backer board.
Breaking down rough cut lumber is a different story. I actually purchased a 24 tooth blade for that. This blade will give you a bit of resistance compared to a lower tooth count blade, and you won't be able to power through the cut as fast. Since I am just rough cutting lumber to be prepared by my jointer, table saw, and planer, I do not need a mirror smooth cut. This blade is also holding up quite well. I have cleaned it a few times, but it is not dulling on me yet at all.
In summary - buy this blade if you regularly cut veneered sheet goods, or require a nice, polished cross cut with little tear out. For simply breaking down lumber, general framing and construction work, a lower tooth count blade will give you better results and make you circular saw work a little easier.