Flickr - is it worth it?

Hi all. I was recently thinking about upgrading to flickr pro. Who here has it and what are you're thoughts? It's not too expensive, but I'm not sure I like the interface. I'm thinking of trying to get simpleviewer running on my website. Maybe I can do both.

Anybody have bad experiences with either?

I use Flickr pro. I cannot compare this with any others out there, since this is the only one that I've ever used. While it's not perfect, for the amount you're paying for, I have no complaints and probably will continue to subscribe to it. I even had an online travel publisher contacting me -- after finding some of my travel photos using the "tag" in Flickr -- and asked me for my permission to use them for their publication.