I tested darksend today!
...
Another thing I want to mention: when testing a transaction, it costed me 0.1 DASH as a fee. I know that with transactions, fees are involved, but 0.1 DASH (around 0.001 BTC or 0.25 USD) is pretty hefty. Will fees be lowered someday?
Try to find topic about "Dead Change" at dashtalk.
Darksend can cost you nothing sometimes. It rounds up to the smallest denomination and the change goes as a fee to miners/masternodes.