It comes out like a hard plastic rather than soft rubber. I have two different types of patterns on my grips. I like them both but prefer the "pebbling". Honestly, grip-tape still provides more friction, which I find suites me better.
(I used the smallest one on the left for practice, as you can see).
You'll need to be careful -- and should possibly practice on a backstrap first -- but you can sometimes 'redo' a stipple job if you don't like it. I found that I could stipple over patterns that I was making on my small backstrap. I only went over a section once or twice so I don't know the effects of excessive passes but I found that I could correct errors that way. You might be able to do the same on any section with which you're not happy.
From what I can see it looks like you did a good job.
Don't know anything about competition shooting, but if they make a seperate class just because of stippling I would think there is a real noticable advantage to doing so. Haven't shot since I done it. Curious to see the results.
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