I used hatchrite for my BP eggs. Needless to say, I had to actually switch to vermiculite half way through the incubation. For my first year hatching balls, it was a bit scary to say the least.
Now saying that, I LOVE hatchrite for my crestie eggs. I will never use it for the BP's but I will stick to it for the cresties'.
I agree, its less stressful to have confidence in your incubation medium and for me vermic is the way to go!