I think the mechanics of one's break stroke and ability to control the explosive power we all lust for, but seldom consistently attain, are the key factors in determining the break results. Arguments are waged over light cue vs. heavy cue, velocity vs. mass, etc. these debates will never go away. The arguments are just a part of everyday pool life and will be around for decades to come.
Having said that, and having earlier posted that break cues are bullshit even though I confessed to owning two (2).....Yipes.......but it's all just a marketing façade. If you deliver your stroke without maximum, full exertion.......what I mean is you're not busting a nut to slam the rack as hard as you can.......and so you control the effort to say 90% effort.......you'll hit the object ball in the rack you're aiming for much more accurately and 90% power accurately applied is better than 110% power misapplied, i.e., wrong contact point.
Look at softball, baseball, golf....swing with all your might and you get pop-flys & foul balls or errant drives 310 yards out of bounds. Dial it down a bit in the power department and your have a more controlled swing and the results are amazingly better........the mechanics are more important than the amount of energy behind it.....Just what I learned from other sports and 50 years of pool playing.
Stroke the cue ball with less violence but with closer attention to where you're contacting the cue ball....say 1/2 -3/4 tip below center which is my favorite point to hit..... and very closely focus on where you want to strike the intended object ball in the rack, ex. full, 3/4, 1/2, 1/4.....focus like it was a 6' long, difficult cut shot......do not take the shot for granted because it can determine the outcome of the match. This is the secret to a winning break shot and the piece of timber in your hand doesn't matter as long as it's equal to any straight, decent condition pool hall cue. Don't buy into the fairy tale that a break cue will improve your game.......it's not true but others will tell you about some time when they averaged 3 balls on the break with their new break cue.
Well, everyone remembers an amazing incident......Why?.....Because it rarely happens and that's why it's called amazing. But that same fellow will not do it again soon and if he does, then he could get the same results with a house cue......Why?......Because he's mastered the temptation and hits the cue ball with controlled violence and it strikes the rack exactly where he intended. The scatter of the balls becomes predictable and that's why pros make the 9 ball on the break in the side pocket so often. Their cue ball strikes the rack with amazing precision and the scatter of the object balls is amazingly consistent and very predictable. So trust me.....save your money and practice to improve your break mechanics and you'll definitely get better results.