Reviewers mostly praise the Nisplay N2 tennis ball machine for being an easy-to-carry practice partner that helps players train solo without a coach. Its ergonomic design and consistent ball feeds make setting up drills quick, and the $900 price tag (without oscillator) is often called affordable for beginners and intermediates. The only caveats mentioned across reviews are that the machine lacks built-in oscillation, and the battery life is not discussed, leaving some uncertainty for longer sessions.