User blog comment:U N Ovvrn/Kha'Zix rebalance/@comment-24420226-20140704142138

I don't feel forced to evolve Q. I've always liked to eveolve Q first, mostly for the range increase (even prior to season 4), but it usually depended on what I needed. If I'm jungling, I tend to evolve E first for easier ganks and earlier plays to get me or my laners snowballing. I occasionally evolve my Ult first if I was worried about longer, drawn out fights (it's especially nice with the new 2 second stealth time, gives me more time to catch my breath and wait for CDs).

Speaking of his ult, I feel like you severely undersell it. As Ultimates go, it's not a terribly long cooldown to begin with. The move speed bonus, especially with 2 seconds, is a lot more powerful that the numbers appear. With the evolution, You get a total of 6 seconds of 40% move speed (that doesn't actually decay) plus 3 iterations of the 25% on hit slow. This thing is impossible to run away from, save from a 3 second snare from Morgana or flashing over a wall (where Kha'zix then flashes after you).

I agree though that the range on isolation makes it difficult to use that mechanic effectively. I would have the range maybe halved - or even removed- from proximity to lane minions. This does mean that mid and late game he's still unlikely to get it (since that's when everyone should be grouping up), but that's perfectly fine by me; As an assassin, Kha'zix should be oriented around making early plays to carry him into mid game, not simply farming and outscaling opponents.