While I dont have an e90/e92/e93 as of yet, I do have the Evosport Pullies on my E36 and when I installed them the results were similar as advertised for my application.
Having been in this industry for quite some time, I have never known Evosport to be dishonest. The honesty, reputation, and commitment to their customers have kept me as a long time customer and a company that I refer others to.
If one is really questioning the results of these pullies, then why not purchase them and try them for yourself rather than assuming what the results are going to be. At that point, if you are unhappy with the results, I am confident Evosport will work with you so that all parties are satisfied.
I do have an E90 on order and upon its arrivial I will be installing Evosport Pullies on it and will report my results.