There is plenty enough experience in the game, without having to waste a perk slot on Lessons Learned, or any of the other +experience perks. Hell, you could be level 50 with things still left to do, even if you took Skilled, which nets you a loss of 10% experience. --- By reading this, you waive any rights you have to feeling bad about my making fun of you. Thank you for your time. :-)
No, and I'm not even a fan of minmaxing. There's an infinite supply of XP out there, just aimlessly roaming the wasteland will grant you more XP than a perk ever will. Use the perk slot for something more interesting that suits your character instead.
This and Swift Learner are definately NOT worth it. It's too easy to get XP in this game. Just go to OWB or The Divide and kill things. Everything should net you 50 XP and there's PLENTY of things to kill that respawn. Especially in OWB with the Lobotomites and police/military cyber dogs. --- This universe is mine! I am God here!