Willard's is a good tip shaper, but there are two major problems if this is to be your only tip tool. The first and most important, IMHO, is that Willard's is just a shaper, not a tapper or tip-pick. If you use this to dress your tip and make it easier to hold the chalk, you will certainly find yourself spending more money on tips than you saved on the tip tool. The other is that Willard's shapers come in nickel or dime shapes, not in both. Thus, if you change preferences you will have to buy another shaper.
In light of the above considerations, I would suggest that you either buy another tip tool that accomodates both shapes and has a tapper (or pick), or, if you are set on either the nickel and dime shape, buy a Willard's but also buy a tip tapper or tip pick. It is essential to have a tool that dresses your tip without taking off leather. If you play on a regular basis, this is the only way to prevent frequent tip changes.