[kuratkull]

I think it'd be really hard to prove any single tool provides you a specific productivity boost. Most engineers probably have a tool-set. Which means all those tools work together nicely. Taking one of them out, as well as adding one, might break the whole setup. Usually established engineers are not working in a vacuum, they already have their setups in place, so justifying a 3% extra cost might be very hard to justify for very unclear benefits, if any. I'm not trying to make a definitive argument, just some food for though.