I bought a Combo kits for Ryobi tools for my husband, last father's day. I know enough about tools to make decisions, but there were a few key items that I would need to look for in order to satisfy my husband's needs, which are basically "around the house" type of choirs. I wanted to find a product that had interchangeable batteries so that he could go from sawing to drilling something in a short amount of time, with little hassle. Another selling point is the length of time that the battery will last. Nothing is more irritating then getting half way through a task and then having to mess with...