The tip-tank BN2's climb like a homesick angel, compared to those without!
If the BN2 behaves the same as a C210 with tip tanks there a few other benefits you will enjoy. For a given weight they have better STOL performance. Also for long trips it really pays off to cruise a few thousand feet higher than you normally would because the speed is higher than non tip models especially when hot and heavy.
Flying high is quieter (a good thing in a BN2) cooler, smoother and gives you greater range. The down side is they're a few knots slower (2-4) down low.