TRC and
xxxHolic, I think, are the two series I’m reading where I pretty much need to reread things a year later. Del Rey’s translators also tend to do a pretty good job of making things a lot clearer than the scanslations, and of explaining things. (Note: Not slamming the scanslators, who don’t do this for a living and have the fandom demanding chapters the second raws are out.)
Of course, these volumes were right in the middle of the 100~ chapters that I read in the space of about a week a while back, which could also contribute to my “it all makes more sense now!”
( spoilers )