I'm totally in love with the new upload possibilities that Sta.sh brings along for me!
I normally use Flickr Uploadr (a desktop stand-alone application) to upload and title photos I submit online. Sta.sh has somewhat the same feeling and strength as the Uploadr, which increases my productivity - so to speak.

I no longer have to upload each photograph one by one; I can just drag a bunch and let Sta.sh do the rest.
There is no need for a description, which limited the speed I could upload photographs with when I used the normal deviantArt upload, since some photographs just didn't need a description.
It is a lot more clear where you are, how many pictures you have uploaded and of course there is the "publish when you are done" function, which really gives the end-user a lot of power and control.

So for me, they have fixed a lot of issues with deviantArt's core (outdated) functionality. Glad they are not sitting still with time!

I also read that Sta.sh is for premium members only (read here). Who knows why/how/when this applies, since I have just uploaded a bunch of photos with it!

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Here are some photos I just uploaded with Sta.sh: