I think I need to amend one of my previous threads
It's not Unsealed Spellbook that sucks, it's basically all 3 keystones in Inspiration. Outside of very specific circumstances (Pretty much Kleptomancy on Ez and GP) these keystones just don't seem to do much. Add into the fact that I don't think much of anything in row below that (Hextech Flashtraption/Biscuit Delivery/Perfect Timing. I mean, I guess the free 300 gold from Stopwatch is okay) I can really only see Inspiration as a good secondary tree. I don't mind the free boots but even that's okay and I do love Cosmic Insight, but outside that, I don't know, the entire tree seems pretty meh.