The Harbor Freight hole punches just don't stay sharp. They are not made from high temp steel. The problem that I ran into was that after I cut a hole, the edge of the punch would get distorted and need to be ground down each time.
If not, then it would eventually get so bad that the punch would not fit in the opposing piece.
Result would be.......SNAP.
I don't know how many holes you would need to punch, but I think if you are not doing more than 10, it may be worth trying the set.
If you are going electric, then you will need a large hole for the element. The kit comes with that punch as well. I only needed 2 of those holes, so it was worth it not to buy the $70+ 1 1/4" punch from Greenlee.
I spent $40 on the Greenlee 13/16" punch from Amazon and you can definitely tell the difference.
All of my fittings are 1/2NPT. I decided to go all stainless. Found that it was a lot more dificult finding fittings locally, but I live in a city of around 65,000. I had to order about 50% of them.