I also got this response on another blog:
Gigapan Epic Pro like all Gigapan products shoots in a selectable grid pattern. It is 100% possible to shoot a full 360x180 panorama. Ultimately it is better suited to longer focal length lenses as opposed to super wide angles or fisheyes. Simply because the Gigapan cannot take advantage of the differing amount of shots per row. This means you end up taking far too many shots because you are locked into a grid shooting sequence of equal amount of shots per row.
The Gigapan has no issue shooting the Zenith shots. It's only the Nadir you need to shoot and this can be done on or off the Gigapan. It involves moving the tripod/panohead and shooting the area where it was positioned when the panorama was shot. With a longer focal length lens this may require multiple shots. You can use PTGui's Pro grid stitching feature mixed with VPC (View Point Correction) to stitch in the Nadir shot/s. All 360x180 panorama shooters have to do this regardless of robotic head or manual.
As for the Panogear product. It also works, albeit rather slow. The advantage it is you are not locked into grid shooting. So if you must have a robotic head with a Fisheye (on the cheaper end) this product is OK.
I guess what I'm saying is you already have the gear so learn how to make panoramas using what you have. If you get stuck along the way; head back to this thread and ask your questions or post up your problem.
And when I spoke with gigapan reps, they said it was possible, however, salesmen tend to want to make you believe anything.
Do you have a particular setup that works for you?
I have a Merlin mount (well two in fact) which is the same basic mount as the Panogear product, although that has added accessories such as the LiON batteries.
But I use it with a small Nikon D40 body that fits at the NPP without the need for modification to the dovetail clamp or rail.
I tend to shoot sphericals (360x180) with fisheye lenses and then use a manual pano head (I have several) because with so few shots required to cover the FOV there's little if any advantage in using a robotic pano head especially when the Merlin/Panogear has a relatively large nadir footprint.
If I was to shoot a spherical with longer focal length lens - necessitating many more shots - then I would probbaly use a 35mm or 50mm prime lens and the Merlin/Panogear robotic panohead with Papywizard running on a Nokia N800/N810 Internet tablet over a Bluetooth wireless connection.
Papywizard, and the T&C ouch Controller (with both Merlin/Panogear and panonned heads), can record shooting co-ordinates in an XML formatted data file that can then be used with APP/APG to assist the stitcher in placing 'featureless' images.
Both systems can also shoot an optimised pattern for spherical with fewer images per row as you approach the zenith and nadir.
Do you really need a robotic pano head to shoot sphericals with a 16mm focal length lens on a fullframe body, when you only need 14 images to cover the 360x180 panoFOV?http://www.vrwave.com/panoramic-lens-database/canon/
Why not buy a Nodal Ninja NN4 with R-Dx rotator manual pano head instead?