I came back in Feb. totally addicted again. What got was the mercs. With a T5 healer merc I can 2 box or 3 box lots of quests/missions including some of the HoT progression. With those it is easy to level up fast and you don't need to spend a bunch of time LFG.
Definitely. The Time locked Progression (TLP) Server is a thing of beauty. I'd recommend the Fippy Darkpaw version, however, as the Vulak is just the newer version of The Sleeper and doomed to merged with Fippy before year end.