Really good fight. Definitely challenging, although its memory is somewhat overshadowed by Siegecrafter Blackfuse and Paragons of the Klaxxi. Phase 2 was a pain, phase 3 was chaotic, phase 4 was easy. The transitions solidified Blood Elves as the masterrace (AoE interrupts were golden).
I always thought 10H looked easier. (World 1st 10H literally solo healed it.) But 25H was mostly hard because it meant more people that had to not screw up.