+1, flipper strength is critical on bsd. There is little room for error on this pin and if you can't consistently make the ramp shot or only make it half way and then sdtm, you are doomed to fail. I have yet to get all thre mbs going after abot 2 months of owning it, but I replaced the flipper plunger, springs and coil sleeves and it made a big difference. Went from loop champ of 14 to 21 almost immediately. I love the pin, so hard, but great callouts, dots and theme. Never liked wh20.
At half the price, bsd is a no brainer. You could get bsd and hs2 for wh20 money.