The leverage principle is key to providing many high-quality compound exercises (the major, multi-joint movements) on a single machine. Leverage permits the replication of natural angles of movement, provides balance and stability, and best of all, offers movable, steel-pin safety to prevent a load dropping in the wrong time and place. You can train seriously without an extra person in a safeguard role.
Powertec designed the original leverage home gyms 20 years ago. They've stood the test of time and have been frequently copied. All carry the highly-requiring European EU-957 standard for performance and safety, are tough and are of extremely high quality. Few others imported to NZ (if any), carry the EU-957 certification.
Leverage gyms offer several very major benefits over others. They provide the most important and productive exercises in a highly effective form. Presses, lifts, squats, rows and many more. Most "home gyms" don't; in fact, they often do little that's really useful. They're often cheap-to-make devices with a few vertical cables strung through pulleys to offer mainly isolation (single muscle) exercises. They provide very few of the important, heavily-engaging, pressing and lifting movements. There's little adjustment for body size, and grip variety - very important for proper development. The structure is typically flimsy, which reduces pleasure and commitment. Not the case with Powertec equipment.
In short, well-designed leverage equipment provides the power of free-weight training (for instance, rack, bench, barbell, weights) with the control and safety of a machine, in, very often, less space than a free weight set-up.
Better still, with the variety multi-function leverage gyms offer, you can create circuit-style programs that can emphasise, pace, load, or intensity, so as to address all major fitness goals, ranging from strength, size, leanness and cardio gains.