This is so worth getting. I've been doing my nails for years with normal polish but am still adjusting to the different viscosity of gels, and how you need to be so much more careful with not getting/leaving the gel on your skin. The remover pen is incredibly helpful for that and means I'm getting better edges to my manicures (which also helps them last longer)
The only reason it's not a 5 is that it doesn't take long before you lose the sharp-edge of the tip, which is important for the crisp lines. I don't think there's much that can be done about that because the tips have to be porous enough to absorb the acetone, but it's important to recognise that these will require regular replacing.