FAP excels at the most important characteristics of a font Manager: Stability and Reliability. I'm unaware of FAP EVER causing a system or Application crash.
All in all a VERY STABLE, RELIABLE product. I've often forgotten to disable before major system updates, with NO issues. Databases seem to survive through multiple Apple software updates, which makes me suspect Insider adheres to and/or keep up with Apples' guidelines.
Amazingly, I can't recall a conflict with any major program (bear in mind, I never update anything when it first comes out).
A very flexible, functional 2 pane interface that's reasonably attractive. Unfortunately marred by occasional dependance/funkiness in dragging operations.
They DO steadily add missing features usually without charging.
They do a better job at handling the Adobe Creative Suite than any Font Manager that I've tried (And trust me, this is no simple task, since Adobe seems to thrive on disregarding Apple's Font management guidelines. -- Ah… but that's another rant)
BIGGEST COMPLAINTS (YMMV):
(Note that they all have to do with painful setup - painful at least for experienced fontheads and control freaks)
1) There's no proper way to transfer DB from computer to computer.
2) Setting it up for all Users on a computer, is a complex pain (I've done it at least 4x now, and I still have to reread instructions multiple times. C'mon Insider: This REALLY should be a script which users could download and run.
3) Lastly, but most annoying: I purposely have my fonts organized exactly as desired (Like many folks who really require a product like this) (in my case based on source, FontFamily and font type/style). Recreating this in FAP is a multiday affair, since it does not recognize subfolders on your HD. So If you drag a folder named for example TEXT SANS (which has subfolders for Avant Garde, Futura,FuturaCondensed, etc) ALL of the fonts are imported into one set - instead of a set with subsets.) Suitcase and FontReserve, handled this flawlessly.
USAGE ANNOYANCES (Many RELATIVELY minor):
Poor handling of System Fonts: You should be able to SEE these from within the FAP Database window without having FAP actually manage them. (including System, Library & User Font Folders)
Still Doesn't handle all font types: doesn't do Apples Font Collections, or PC Fonts, poor rendering of many symbol/pi fonts.
No Activation by Application.
Poor handling of user comments. No way to store user info about a particular font FAMILY. So you need to access by each font face, and even after that, you have to double-click a face to access that info. This may seem irrelevant to some, but the Source of the font is pretty important when dealing with duplicates.
Very minimal font information Available. Apple's Font Book is far superior for this purpose (as was the bygone FontReserve)
Could definitely use a more serious AppleScript Dictionary to fill in gaps.
The only anomalies I've had:
In very rare cases (which I believe to be written with improper font handling by the apps' devs - NOT Inisiders') fonts wont be activated. The only ones on my system are: Toast (when you create a titled DVD) and LaCie's Lightscribe Labeler - and I've got hundreds of Programs.
FAP Sometimes activates fonts that are NOT required (ex: a card game I used to have (Mike's Cards?), and also when sending/receiving formatted email in Entourage it activates ALL OSX fonts) In the end pretty harmless but disconcerting, and likely a result of irregular programming by certain developers.
SUMMARY: I HIGHLY Recommend this Font Manager above all others (I've tried at least the top 5 current options) for anyone who has fonts beyond those included with than MacOS and Microsoft Office. It may not do everything, but what it does, it does very well. Nonetheless, It won't get 5 stars from me until it's dealt with at least some of my gripes.