Smith machines are usually a little more expensive compared to Multi Gyms aimed at the general public, Why? Simply because smith machines are designed for experienced lifters who can move a lot of weight! That requires quality construction from a high gauge steeï»¿l
Smith machines are the safest way for serious weight lifters to work out at home. Any experienced strength coach will tell you that working to failure is fundamental to building significant muscle mass.
Of course pushing each set to failure in an unsupervised environment can be dangerous. Smith machines are so popular because they combine the feel of free weights with the safety of traditional resistance machines.