I've been obsessed with drug-free bodybuilding and competitive powerlifting for over two decades. Always preferred training alone at home. Like a lot of people with a garage gym, space is one of the biggest limiting factors. That is where a machine like this truly shines.
The independent arms and rotating pulleys are what make it special. It not a stretch to say that this one machine can replace a dozen or more machines. If you get creative with it, you can do just about any type of exercise.
Here is a tip: buy a specialty barbell cable attachment (the type that has eye bolts on either end of the bar). Attach that to this machine and you have even more potential variations. For example, you can do barbell or hack squats (starting from the bottom position, of course). With a block and a bench you can do seated calf raises, or with just a bench, you can do things like guillotine presses (or "neck presses" as the legendary Vince Gironda called them).
I spend way too much time thinking about exercise, and so far, other than a handful of things (like Olympic lifts), I couldn't think of many exercises you couldn't do with this machine. Here is an example: if you have the barbell attachment I mentioned earlier, you can lie down in front of the machine and do a vertical leg press. Is it an ideal way to do this exercise? Of course not, but you would probably be surprised by how effective it can be if you get the balance right.
What I love about cable machines is the lack of dead spots on your potential range of motion. The older I get, the more I come to appreciate machine exercises because they can be extremely effective and a lot easier on your joints at the same time. What makes this one special is the fact that I've studied exercise, obsessively, for over 20 years and can't think of a single cable exercise you can't accomplish with this machine.
I would have liked seeing higher end pulleys, but it really isn't a big deal. The machine feels smooth enough as it is for me. You might see a bit of an improvement if you upgraded them, but honestly, I don't believe the cost would justify it for most people.
I do recommend either getting a different set of handles, or modifying those that come with this machine. Those plastic cores will not stand up to heavier lifting. You can find aluminum handles with d-ring straps pretty easily online.
Or, if you're frugal like me, you can "fix" the ones you already have. Find a pipe that is SLIGHTLY smaller than the internal diameter of the handles (PVC will work). Use a hacksaw to make a length-wise cut down the pipe. Carefully thread the strap of the handle through the slit in the pipe, then slide the pipe into the handle. I have a couple pairs of modified handles like this that will easily support over 200lbs each.
Overall, this is a great investment, especially if you are short on space or money. There are VERY few alternatives for this style of machine too. Couldn't find a better price anywhere.