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I already owned a stand-alone single stack machine with upper, mid, and lower pulleys, but the weight stack was no longer heavy enough for some lat exercises. I bought this to enable me to go heavier without buying another expensive piece of equipment, and it does the job. You can see from the pictures and the description how it attaches and operates, so I'll just add that the cable moves smoothly along the pulleys - no catching or excessive friction. I already had the Multi-Grip bar and the X-2's included thick pull-up bar at the top of the rack, so I was a little concerned about how clearance would be with the longer pulley arm sticking out toward the middle of the rack in between those attachments, but it is no problem at all. As long as you remain cognizant that the arm is there, you can do pull-ups on the inside bars without hitting it. There is one issue I can imagine cropping up for someone who has the Multi-Grip bar. With the Multi-Grip bar attached at the top of the rack, you only have a few holes remaining to attach the pulley arms. You are forced to mount them toward either the front or the back depending on where you've placed the Multi-Grip bar. With the angled arm toward one end or the other, it would prevent you from placing most weights on the nearest plate holder (if you have one mounted that high). You could fit fractional, 2.5, or 5 lb. plates there, but anything with a larger diameter wouldn't be able to slide all the way onto the plate holder because the angled arm would be in the way. That's certainly not a design flaw of the pulley system, it's just something people should be aware of in making a fully informed purchasing decision.