describe your setup a bit more please - are you playing 2 clients on one machine/monitor and playing both in full-screen (so alt-tabbing to switch between) or are you playing them in windowed mode and just clicking between the two?

The main reason i use maximizer is i like to be able to position/size my client windows and have them "locked" into place on the screen etc - this allows me to see whats going on on each of the client windows etc.