I'm still having fun! I took my marauder summoner to 80 and I feel the build is essentially done, all I need to add is more survivability to make him tankier, but I've reached my goal and I think I'll mainly keep him for dailies.
I did manage to amass quite a considerable wad of currency though (7 exalts in pure and tons of alchs, chaos etc) so that I decided to start a new witch - block/spellblock arc of doom (kutekitteh's build on the forum) and so far it's AMAZING. At 58 now and am using cybil's paw, rainbowstride, cloak of defiance and am about to put on stone of lazhwar and as soon as I buy / get to 68 I'll add in a rathpith globe & remove the rainbowstride to reach that 75% spellblock. With a 5-link arc going on (arc, spell echo, faster casting, lightning pen and not sure what to use last so I use lifeleech until I get my empower to level 2) stuff just melts and I rarely take damage. What's very interesting is that I run a 4-link setup for tempest shield as well with life leech, mana leech and reduced mana, which means I passively regain quite a bit while blocking which just helps my Mind over Matter to be that more effective.
I think this will be the last character I level in this league though, if it dies or I get bored of it I'll just play rampage srs until warlords of draenor comes out