User Interface: As with the other Spectrasonics instruments, the user interface is clear and concise, and easy on the eyes. The controls are logically laid out and easy to adjust. The only slight nag is that LFOs are not syncable to host tempo (yet).
Sound: Excellent basses, upright, electric and synth varieties. Now I can sound like a bass player at last!
Documentation: The users guide is a bit thin on explaining how to use the features of the instrument, but I expect there will be a PDF update from Spectrasonics (the title of the manual is "Preliminary Users Guide").
Presets: I am not a bass player, but the included sounds are amazing to my ears (all 3.1 GB of them). The synth basses are excellent, and completely usable as leads in addition to basses.
Customer support: I have not had any reason to call customer support for any of my three Spectrasonics instruments, but from what I see on the forums here and the Spectrasonics group on yahoogroups, they are extremely responsive in that area. Eric Persing is a frequent poster both places.
Value for money: Considering the quality and quantity of the sounds supplied, this synth gives excellent value for money.
Stability: Given the short amount of time I have had this synth giving a long term description of stability is hard. So far I have had no problems whatsoever (I am on WinXP using Logic 5.5 as a host). Judging from their other instruments, this one should be rock solid as well.
[Added March 28, 2003:] This baby is stable! I have had no problems since I installed it.Read Review