I got the light weight titan bucket scoop, and it works pretty well. I planted 6 trees yesterday in a short amount of time.
After watching some youtube videos of it in action, I had a good idea how to use it - however some commenters mention lifting the front tires off the ground is improper operation, but that was the only way I could get it to dig effectively.
Other thoughts: I removed the tiller to avoid damaging it by backing into a tree, and quickly realized that I needed the weight to gain traction.
The SSQA buckets are worth the upgrade, as I found myself needing to switch buckets mid job..and it couldn't be simpler.