Without limiting my comments as responses to other comments posted here is how I looked at it.
I do not have the 3rd Edition to be able to pass judgement on its utility for the exam purposes, but from how the codes go from edition to new and improved, I am generally skeptical.
Yes, there are many useful time saving tables between the first and second editions. But the examples were a bit of an overkill. They are not simpler versions as in the first edition which reinforce the application of code rather than voluminous solutions.
I agree the Seismic Specifications and Commentary are much more direct and easier to apply than other codes/specifications.
Whether spending money on the Third Edition is worth, only the individual can examine the benefit-cost tradeoff, risk, and decide.