It also gets my vote. It has the nice properties of giving regular rewards as you make progress, being interesting to do, containing pleasant surprises when you accidentally fulfill a step, and particularly towards the end giving a thrilling few days full of jeopardy where you plan a caching trip full of the requirements (and a few second choices) but with the knowledge and pressure that a few DNF can scupper the day and require you to go back to the drawing board.
I'd also say it was one of the big successes of the challenge checker system, before the checker few people completed it because they couldn't be bothered to do the tedious paperwork of sifting through their caches, once the checker was added their was a massive burst in people working through and completing the challenge when they realised they only had a few steps to go.
It is so annoying that similar caches are no longer possible under the new rules :-(.