The tactical site problems are fun, challenging, and I can definitely see some improvement. That said, I still have quite a bit of trouble seeing some of the tactics in real games. The reason I think this is is because I know that there is something creative I'm supposed to do on the tactics website. I have a harder time finding it when I don't know it's their. When I put my games into Fritz for analysis a lot of times I end up saying to myself "Damn! I should have seen that." I suppose it will take more time for me to get better board vision. Or maybe I should just resign myself to mediocrity when it comes to chess.