Looking at the card from the perspective of someone who is quite new to A:NR, Blue Sun: Powering the Future gives the Corp player a lot of control in how to accelerate their economy without compromising their Ice layer. A first turn Hedge Fund into an installed Tollbooth over R&D is a perfect example of a credit sink, and provided you have powerful, unrezzed Ice over R&D, you are effectively immune to Account Siphon and Vamp, even if they break your Ice. The ability to protect your centrals (Or even remotes) with powerful Ice, without actually having to make bigger overtures towards recovering your economy, cannot be understated in my eyes. The impression I get is that rezzing an Assassin in front of someone early is likely going to discourage early runs, or at the very least, heavily tax the runner on Traces. I think the top review covers the majority of things you can do with Blue Sun: Powering the Future, but I wanted to add the fact you're able to better balance your Ice defences with maintaining a steady economy, which can potentially hamstring a Runner by placing very obnoxious effects in front of them earlier than they are realistically prepared for.