I have some, but for me, it's quite gravelly.. Might not be best for some of the stem plants, or plants with finer roots - I prefer sand nowadays as it's less damaging - especially if you're prone to rescaping every now & then.
Can't help you in terms of plant nutrition, though - I put my eco-complete in when I didn't really know what I was doing, so the plants all died anyway, LOL .. it's still in there now, but likely exhausted.. Perhaps someone with more experience can comment?