I spent the $$$ on the master cool hydraulic tool too after reading about perfect flares every time. Haven't used it yet, but I have a lot of lines to re-make!
I've broken three handheld flare units and have had 5-6 good flares from it all. Unless you have a holy grail old timer unit from the 40s-70s, the hand held units these days aren't worth two ****s