G'day Geoff,
I've just had a quick play with the trial software v4 (which I assume would be the same software once purchased, I assume the key just gets rid of the watermark).
Seemed to do a fairly good job, there was a bit of ghosting which I'm assuming (and hoping) was due to me using a "normal" tripod head, not catering for the nodal point of the lens (and the clouds were moving which I assume was the reason for ghosting in the clouds). PF can produce layered
PSD, with each layer being each blended image component, so you can do any spiffy PP after the blend on each "part" of the image.
Autostitch seems good but takes ages in comparison, is VERY memory hungry and only produces jpeg output, if it produced tif I'd probably be happy with it, but want some form of lossless format.
Tried PTGui but even using the control points the output wasn't anywhere near as polished as PF, least on the examples I tried, maybe I just wasn't driving it properly which is a distinct possibility knowing me
Tried
PS CS2 (which does a terrific job) but leaves a lot of manual work remaining smoothing out any exposure differences, whereas PF seems to blend them smoothly. I always shoot manual with auto-focus turned off once I've set the focus, I assume the differences in exposure are due to changing light conditions between shots (clouds moving etc).
On the examples I tried, PF seemed to come out the fastest and required the least manual "fix-ups" or clean-ups, so I'll probably end up purchasing PF. Seems very competitively priced to me being $59US.
Cheers.