I just did the 25 cent trigger job on my Glock 17. I can feel a significant difference in the resistance of the slide when you manually rack it (it glides now).
However, I put the 5# connector back and I think I will keep it this way. The 3.5# connector reduces the force needed for a clean striker release, however I find that it's too "predictable" and I'm anticipating when the striker will be released. With the 5# connector, the extra effort makes it kind of vague so I'm surprised when it releases the striker. I heard this is more favorable with the Glocks. I will try it at the range with the stock connector and the polishing job.
I took out the Ghost 3.5# standard connector because there was a manufacturing defect. There's slightly more material that allows it to contact the mechanism housing when it bends in during slide movement.