I have purchased and am currently using this solution. I like what it has thus far but was a little surprised when there was no main gallery page that displayed all the galleries for my users, instead of just for the admin. I do see that I can place code into a web page that I create and of course that shouldn't be that difficult to do, but was expecting something more.
As for the watermark, I was also surprised that I could only add a simple text watermark. What would be nice is if I could at least change the font and do embossing, drop-shadows and other such text changes. I would actually had preferred if I could upload my own image watermark though.