I have the current 4x5" Gowland front-moves camera and an older 8x10" Pocket View and have commented on them fairly extensively over at the forum on lfphoto.info and also in the comments after the review of the Gowland on lfphoto.info, though I think those comments attached to the review may have disappeared.
You can probably get lensboards from Peter Gowland or make them yourself from modeling plywood. They're simple flat lensboards.
Short version--it's a capable camera that can do a lot, but it's not for everyone. If you need the precision of a Sinar, this ain't it, but it is a superlight camera that can go anywhere, and if you are patient and willing to adjust the way you work to the way the camera works, you can make some fine photographs with it in places that it might not be so convenient to bring a heavier camera.
I usually use the Gowland 4x5" when I'm carrying another camera. A medium-format folder, 4x5" Pocket View with 2 or 3 compact lenses, a couple of Grafmatics, and a light tripod make a great travel package. For bird photography, I carry a 35mm camera with a 600/4.5, and I put the Gowland in one of the pockets of my ScopePak for landscapes and macros between bird photos.
The 8x10" Gowland is my 8x10" field camera. I carry it in a knapsack made for laptop computers. I've done a few things to make it stiffer (some bigger washers, better knobs, bellows compression straps), but he's improved it since mine was made, so a new version might not need any modifications.