I am just about done with book 7 of the Wheel of Time series.
You're lucky, my best friend got me hooked when only 3 were out, and they were coming out 2-4 years apart. Had to reread all previous books every time the next one (or two) came out. I'm on my 5th time through because I gave up, and just bought without reading the last 4. (Though my wife assures me they are excellent, and likes Sanderson's style a little better, but admits it took some getting used to. Also, she is pissed I haven't read them so she can't talk to me about them.) I'm just starting Winter's Heart again. Think this is the first one that it is only my second time through.
Totally worth it.