I agree. I guess the downside if there is one is that with these sets you're pigeonholed. The time/gold cost to make Spellfire is going to be significant enough that I'm effectively committing myself to Fire (or Arcane) as you've done with Frost. With Aldor (T4) or Tirisfal (T5) you can respec at will and still get the benefit. This is a minor concern as I am quite content being a Fire mage, it just means I'll be less effective in Arenas and other areas where Frost mages shine. I may try to pick up the Mana-Etched Regalia along the way for added flexibility vs. Fire immunes. Only issue there is 4/5 of that drops in Heroic mode. Incanter's would be okay too I guess but the set bonuses are lame and it's fugly.