TLDR, the 4 Post is nice, but if you've got the space, get a 6 Post, or slightly longer crossmembrrs jf possible. If you've got the money, get the 2.0.
Pros: The pulleys are buttery smooth and having the stack make using the cables much easier compared w a plate loaded option. I feel a much better mind muscle connection w this system.
Cons: It's the v1, the 2.0 addresses pretty much all of the shortcomings this has. Watch a few reviews on youtube like the Ares 2.0 by GGR. The main pitfalls of the four Post that I haven't seen online are centered around the cable clearance between the pulley assembly that slides along the post with the pull up bar when left attached, and the fact that you will need to reset their position constantly if you use leg rollers for lat pull downs. Additionally there is very little room to slide a bench in for bench press, mine barely fits enough to get by, but doesn't work for incline press as they base doesn't collapse as the system rises. The 6 Post with the shortest cross members would remedy both of these issues.