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1. COMPARISION OF TENNIS MACHINES Tennis ball machines are expensive and there are a lot of options with tons of different features. You're going to want to do your research before you buy a tennis ball machine. In this article, will we talk about some of the features of a tennis ball machine and what you should look for as a beginner, intermediate, or advanced tennis player. In short, here are the top features to look for when searching for a new tennis ball machine. 1) Firing Ball Choice Almost all tennis ball machines nowadays use a technology call countered wheels to shoot out tennis balls. This means that two wheels spin really fast a shoot out the tennis ball. You can also vary the wheel speeds and angles to create topspin, backspin, and various different oscillations. The new technology for tennis ball machines is really quiet amazing. Old school tennis ball machines used to use pneumatic pressure to shoot out tennis balls. Pneumatic pressure isn't as good because its more difficult for the machine to put different types of spins on the ball that simulates an actual tennis match play. If you're looking for a modern tennis ball machine, get one that uses counter wheel technology.