I use 0.4 but i'd rather use 1.x, only reason I don't is because I feel like im way too comfortable with the functions in 0.4 and I don't want to learn how the 1.x functions work.
If you're going into this new, I'd recommend using Ninja's 1.2 for 8.6 because it has better functionality, more possibilities, more functions, more stable & less buggy.