I came very very close to getting my endless healer this spring (on priest, which is the worst class because of the lack of cc). I wanted to set a goal that would make me push through and get it done rather than just screwing around with it.

Sadly my desire to be "The Proven Healer" (a large desire) was no match for how boring it is and how frustrating the RNG on waves 4 and 8 are.