I use park tools mini brute at home and the brute at work.
I split around 10 chains a week ?
I use the split link suplyed with the Kmc Kool sl chain and guess what my freind snapped one Kool sl it took 9 months and was due to hitting the chain on a rock and it held up the rest of the ride on half the link in tackt, we realized it had a broken link at home checking the bike over before the next ride. Replace the chain and good for another 9 months, or 6 if my mate replaced his as often as I do.
I know why u broke a Kool sl. You reused the pins after removing them, don't do this if you get the kool sl, use the split link.
If I had enough sl split links I would run a chain made purely of split links for a comp just to prove a point