I don't recommend it at all. You'll lose hp gained from those 3 levels along with stamina and pieces of gear such as the blood ring, garrosh's pardon, seal of argas, stillwater's signet, wind rider wand etc. The biggest thing to me is Cone of Cold, that's a very crucial spell especially when it's improved through talents.It has a shorter CD then Frost Nova, and your pet Nova so it saves you from having to use them... Sure it's playable but not worth it in my opinion because of the loss of health and less CC.