Some serious haters here.
I use Skype Preview. It's still not perfect, but has made serious gains I've the past few months.
The latest build basically broke SMS sync, particularly on PC, but after signing in/out and verifying the attention code it fixed everything. I assume the next build will resolve that.
The live tile still only shows an asterisk for notification, instead of an actual number... Even better would be a message preview and a number count.
Skype Preview notifications don't show up on glance (WHOOPS, turns out I didn't as it. It works).
Skype Preview doesn't show in the universal share lost on mobile. - share option in photos doesn't list it as an option. You must open Skype and as the photo to a message there.
That's about all my gripes, everything else seems to be fine after a lot of improvements. I suspect we'll see it make the biggest gains coinciding with OS builds. I also suspect tat the next build, after Creative, will see It's "completion".