Who logged onto the domain?

We have only five domain controllers and I've recently been looking at a tool that will let me more easily see who logged onto the domain when. I found looking through the security log of each domain controller to be remarkably painful. I wondered if this information might be gleaned from any Microsoft tools that might be included with our Enterprise agreement. Or perhaps SCOM could give me this information? Trying to avoid purchasing another tool if I can. The end goal be able to quickly see who all logged into the network between time A and time B. Thank you.