That's one of the top concerns I have as well. But, as you point out, the majority of the time that's not the case. So far, we've found that the notifications provide better transparency than the more common "here's all the work I did over the last month." I recently had a case with our accountant where I received a bill 3 weeks after the work was done and I totally didn't remember it. I emailed her and then we got on the phone to talk about it. All of that is wasted time (and money).