The UI seems intuitive, linear, and very sticky (ugh!), and I've had no real issues, apart from one post which didn't seem to appear on my blog, yet appeared on FB, and a duplicate posting. These might be down to niggles with the way I've set up auto-posting, I'm not sure.
Overall, it's been great, and it's actually added value to my Social Media experience. I'm a sucker for new stuff, sure - but it's rare that something brings so much extra to the table.
See this Amp at http://amplify.com/u/89ty