Kit loves to study, especially with Omni-drive and Lockpick acting as key supporting sources. All it takes is a good draw, or a trip to Tyson Observatory to find the citations you need. See, you can't just walk into the final exam with one power counter and hope you're going to be able to boost up to face whatever nightmare the Corp has for you. You think you can afford that with your Student Loans? With recurring credits you're essentially able to boost for free, every turn, at any time! You'd be surprised at how quickly the counters stack up. With a Paintbrush on the table (using the MU you freed up using Omni-Drive!) or Tinkering in your hand, you can easily batter through multiple layers of ICE with minimal expenditure, since an investment in Study Guide is an investment that stays there the *entire game. Of course, such a valuable investment quickly becomes a massive target, so a Sacrificial Construct can also be useful.
Honorary mention also goes to The Toolbox, which is an excellent choice of console if you want to get more out of the Hitchhiker's Guide. The issue is usually that when you have enough money to get it set up, you already have the economy you need to fund public education. However, it won't ever rotate out, unlike Lockpick (bless its tiny decoding soul).
Egret is another possible supporter for Study Guide, acting as a permanent Tinkering on a single piece of ICE. I haven't fully tested it but it seems promising if less flexible (and Scavenge can help with that, of course). Just watch out for Magnet**.
I'm not sure if I could recommend running Study Guide by itself - it's definitely a breaker that requires support. But if you give it that support and play well, it can absolutely pay off. No server is safe! No ICE is unbreakable***!
tl;dr - Study Guide is really amazing and with a little Tinkering can even be your only breaker, but Lockpick is rotating out soon and we'll have to reevaluate after that