You might think a coffee tamper is not a big deal, but you have to realize that poor tamping is a frequently made mistake by novice baristas. When you make espresso, you are supposed to tamp down on the grounds to compress it and push any unwanted air and moisture out. If you don't do this, there will be impurities that will negatively impact the flavor of the coffee.
Therefore, it is essential to carefully tamp down on the coffee grounds to make sure that, as much as possible, only pure coffee grounds will get infused with steam and thus impart its flavor on your espresso. There is a particular artful technique when doing this, and it is something that you end up learning while doing.
Learning how to tamp down on coffee properly is best achieved by using the best tools available. The Motta Coffee Tamper is a good contender for that title. So why not learn how to tamp using one.