they basically just force a skill up to happen... so if you've bought everything else you might want from RoE... I really don't see what else you have to get with the points.

Though remember, 109 and 119 pages are capable of being gotten from RoE... so... I dunno.

I feel that with the RoE skillup armor... + the classic rings + food.... these books are a waste of points.
(or rather, saving for 119 AF pages is a better use of points... or just saving for the skill up gear.)

But if you already have everything... why not?
You got nothing better to spend it on... and who knows, maybe the top food (and even the RoE armor) boosts the likelihood of the books giving you a +0.4 and +0.5...
No clue if they do or not...
But if they just force a skill-up to trigger... then they should.
But if they are a "fake" skill-up trigger (as in they just add a variable amount like a real skill-up) then they wouldn't...