Sorry to bump an old thread, but I feel like OLL/PLL is holding me back from improving, I average mid-13 and my LL is really bad and I can't seem to raise its TPS. I'm pretty good with M slices so I was interested in ELL, what are the pros and cons of CLL/ELL? I already know and use COLL (minus sune/antisune) and I really like it.
EDIT: My cross+F2L time is about 9 seconds
If you like M slices and don't mind learning lots of algorithms, you could learn OLLCP (321 algs), then every PLL will be an M/U algorithm.