I'm always amazed at the vastly different experiences people have with their machines and software, especially with font managers in this case.
For example, in my case [ keep in mind, I run these managers on four different machines concurrently], FAP simply doesn't auto-activate fonts in Photoshop at all. I have no idea why. Also, FAP will not activate a font in Photoshop unless I quit Photoshop first. Four machines do this. As for FAP in InDesign, nine out of ten times, I have to load my ID file, close it and load it again for the fonts to kick in. Four machines do this. Illustrator works as expected. I don't use Quark any more, so I don't know how it works there.
Also, installing thousands of fonts in FAP takes forever because of all the corruption detection presumably. X1 is amazingly fast at loading fonts. Also, it's much smarter (you can drag in five folders and X1 will use those folder names as font sets, FAP bunches them all into one). X1 now has Font Doctor, which works brilliantly and much faster than FAP (though it is a separate application and requires a separate step). And, AFAIK, there is no server version of FAP (or is there?).
As for plugins, FAP absolutely has plugins. Just like Suitcase.
I did hop on Suitcase when it first became OS X ready, but it was indeed still buggy. X1 is very solid and very fast on four machines here.
I'm not necessarily trashing FAP, I used it exclusively for a year. It's solid, if slow and, for me, not fully operational. Their support is far better than Extensis's, but I've never needed support for either product. Insider Software better stay on the ball, because with Extensis merging X1 and FR, there is no reason why that shouldn't easily be the best Font Manager available bar none.
And what the heck is up with Alsoft and Juggler? No demo? What are they thinking? That product has no chance in hell without a demo, and a slim chance even with one. It's a good thing for them they make the best utility in the world (Diskwarrior), because they're not going to make a penny on Juggler.