I bought the 3.0 SI version as it seemed reasonably priced.
My main uses are for deconvolution and wavelet processing, to unblur my planetary and lunar shots a bit. I found it more appealing than using Registax's wavelet sharpener - the results are pretty damn good!
To be honest I don't use many of the other features as I can do most of them elsewhere (e.g. Photoshop or GIMP [free]).
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