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Id agree with Brett generally, when it flys, its a killer, but it has "issues".
To get a bright enough guide star for 30hz corrections is very rare indeed (close to the object imaged). You have to be sure before purchase that you have enough back focus to handle all the gear required plus adaptor hell (about 8 inches). Forget internal guide AO on an SBIG youll need an AOGer and external guide cam etc.
I look at it this way. If you want to bang out a variety of objects in a reasonable time, you wont use it much, or the AO advantage if you do wont be huge . If you want to produce a standout masterpeice, with all the time and patience that involves, on a rare object that has a mag 3 guide star in exactly the right place, AO is the last mile, essential.
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