Compared to Smashwords? They are heavenly. Most books, from my experience are live within a day or two on most channels. I haven't uploaded a new title in a month or so, but BN was having longer upload times then (up to a week, still much faster than Smashwords).
You also get daily updates on sales. I think Smashwords may have began reporting daily sales a few months ago, but I'm not positive.
I've found that uploading to Draft2Digital is easier than KDP, KoboWL, Smash and Nook. It's quick and user-friendly. You also get paid every month, which is great. If you don't have the skill, the time or the money to pay someone to format your MS, Draft will do it for you quickly and without pain. They spit out a great looking file, but obviously without customized fonts/title page/etc...