I've been using Sketch on and off for about that long as well, and have probably only had that many crashes too. Non-crashing bugs, however, still abound: Even after installing the update just this evening, I ran into a new undo bug where an undo would jump back about ten or so actions, while redo would step through them one by one. And this is to say nothing of the perennial issues with object alignment, the inexplicable inability to move an object along an axis with the shift key, something I slogged through again this evening.

That said, most of these things can be worked around, and the benefits of Sketch are enough that a lot of designers can overlook them. Personally, though, I'm probably going to switch full-time to Affinity Designer once symbol support is released.