I agree - it is still in the beginning stages. However, so far (for me at least) I'm willing to give it a go.
I've been able to make a partial refund (for a shipping reimbursement) so I think that has been resolved. I know on multiple orders, I've also been able to put in the amount of the refund to make - DC doesn't automatically assume.
I also use stamps.com - nice to have all of my postage in one place instead of some in PayPal and some from the post office (for international orders). And, I can print international labels from stamps - woohoo!
I use Quickbooks for accounting purposes, so the breakdown happens for me within that program. Not a great fit for everyone, but it works for my shop.
It will be interesting to see how DC changes as time progresses.