I gave this a try today along with Item Sets. I noticed that the tooltip seems to always attempt to drop down, rather than switching to dropping 'up' when you have it at the bottom of the screen. This means that if you do have it on the bottom, the tooltip actually covers the entire plugin. While that's a little on the annoying side, it also means that you can't access Item Sets without moving the plugin. The plugin can't be moved after it's positioned there without either anchoring another broker item to it to make it wider than the tooltip, or adjusting it directly in the settings of your broker display. (In this case, Fortress.)

I understand this probably isn't a priority for you since it's working for ya, but I thought I'd relay the issue!

Actually, I guess it's really not a priority with the gear manager coming in 3.1. :-/

Clicking the icon to show the window would be great!
And I have the same ugly and broken tooltip graphics when no sets are defined.

Thumbs up for that idea. Or simply on leftclick. Any way to get up the ui without typing would be nice.

I'm trying out the broker plugin via Fortress, would it be possible to make the UI show when right clicking the block (rather than having to /is ui)? Thanks.

Also, the broker does not seem to display any text. It certainly does not display the currently equipped set. Using it together with ButtonBin, btw.
When I disable text for the broker, it seems to go one step closer to its adjacent icon, so I guess it actually does display some empty string or invisible text, but it cant be much. The icon only moves a few pixels when I enable and disable text.

Thanks for the Broker to Item Sets, btw!

The dropdown looks kinda ugly if you do not have defined an item set yet.