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They work very well, mostly.
I have used an A07, it was a real pain, but if your patient and pedantic, you can halve your FWHM.
It corrects for small PE errors, and if they exceed a set amount, a mount correction is issued.
It is difficult to use, you need a bright star for it to operate optimately, the brighter the star, the faster it corrects for atmospherics and mount PE. 20hz or more is very good, 2 seconds or slower gives no advantage (same as mount corrections).
The problem is finding a star bright enough to make it worth it, endless cam rotation to find a star (unless you set Sky up to find one straight up, or, idealy with a auto rotator) can be tiresome, and you will need a set of flats to match each time you change the angle.
If you get 7 arc secs PE now in urban skies at 1800m FL, the improvment maybe marginal, given FWHM could be 4-6 arcsecs to start with.
In your case its gets down to how keen you are, if you are prepared to spend lots of time in setup go for it, but from my experience, megadata can reduce FWHM in a similar fashion without being restricted to objects near a bright star, or a new set of flats everytime you image.
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