From a liability standpoint, Smith Machines are really excellent. But even if it’s going in your home, a Smith Machine is great to give you enough structure to train alone, but also give you great flexibility in terms of exercises. They’re also extensible, lat pulldown attachments on some, such as the Body-Solid Series 7, and selectorized weight stacks. Each one is custom-configurable with the options you want. Another great option is the CXT-225, with an optional Smith attachment, it also functions as a great cable crossover that fits tightly in a corner.