i've used teh super chunk stuff before...
i did not like it... yeah, base 1-2" can be fine if you do that... in fact teh chunky stuff is probably better for that. i think it's too much obstruction to roots as well as not as effective impoving dainage, while still taking up same sapce ("lbs for lbs" so to speak))
you can easily crunch it up a bit... doesn't take much force to break it down slightly... not that i think it is woth the effort. splitting hairs, but i wasn't a fan of the super coarse stuff.. What i used was #4. I think the stuff that comes in teh premixed mothe earth is a bit too small.. so you know.. fuck it, lol. still prefer convenience relative to small pecentages.