Often a project can go well except for one thing. A single screw, for example, that doesn't want to go in, or time wasted constantly changing drill bits, can hang up an otherwise perfect project. Investing in specialty tools like those shown here can solve typical problems to help get jobs done right with less time and effort.
You should inspect your roof at least once a year. Nothing beats getting up close, but a good pair of binoculars can give you the next best thing. Look for curling or buckling shingles, shingle granules in your gutters, and other signs of wear.