OS X is almost awesome with the new font handling features:
native support for postscript, yeah!
native support for Windows truetype fonts, yeah!
Always on, but not always hogging RAM, yeah!
Opentype support (don't underestimate how awesome this technology is), yeah!
But it's crippled by the simple fact that you must drop fonts at the root directory of the library folder instead of being able to sub-categorize. I have all of my fonts organized in folders like Serif/Display/Sans Serif/Caps, etc. and then another folder for the printer and screen version if postscript. OS X makes me float the fonts in one big giant list with no organization whatsoever. Sometimes screen and printer fonts are titled differently, so they end up separating alphabetically. Total mess. Just let me drop in any folder, named anything I want, with any number of levels to the folder and as long as there's a font in it, then OS X should figure it out for me in the app.
I've always used ATM Deluxe because it has system-wide auto activation, which no other font manager has. Font reserve requires plug-ins for a limited list of apps (albeit, critical ones). Auto-activation is critical, andthe fact that Suitcase 10 can't pull this off in X is highly irritating. Why on earth should I have to go tell Suitcase to activate a font when an application calls for it? Worse yet, some apps (Textedit) wasn't even smart enough to alert me to a missing font from a previously saved document, it instead just substitued a font. Bad, very bad.
I would switch to Font Reserve in a second if it had auto-activate in X for InDesign & Illustrator. Still, I'll live with manual activation if Opentype catches on. Opentype is fantastic.