I'm a Kreg novice. I've now used the system for 2 projects and a couple of small utility shelves. It's very convenient. But the holes, especially in solid wood, don't drill cleanly. Specifically, the left-hand edge of each hole (that's the side that the drill bit cutting edge would be "emerging" from, as opposed to the side that the bit edge would enter the wood) comes out raggedy-looking. Here's a photo, which is not terribly detailed:
These holes aren't going to show; this is a "frame" to hide the ugly plaster hole left by the guys who put a through-the-wall air conditioner in my Mom's house. In this case, the wood is maple. But it did the same sort of thing in pine. I think I used a cordless drill this time, but used a corded one (higher rpm, I think) with similar results on the last project.
I will add the tally on this bit is only maybe 100 holes. Any ideas?