These things are great! The clay here is so hard that when I try to hand shovel it I can't get in an inch.... Now the only sweat I break is, well, I don't break a sweat.
I've found that 3 things improve my backhoe-ing...
1. Keep the engine slow. If I'm figuring correctly, and from what I've observed, I don't get any more power from the hydraulics, they just move faster. When my backhoe bogs down and doesn't move when under too much clay/dirt, increasing rpm hasn't produced more power to get the bucket through the stuff.
2. Just like any other hydraulic... make small control movements
3. Same advice as for newlyweds... practice, practice, practice. Well maybe that's for my fly casting, guitar, daughters' fiddling, ...