Here's my third Handheld Panarama Laserpointer system for 8mm fisheye lenses and it's confession time. Although I uploaded a picture of a HaPaLa 2 in March I have never actually used it for my Flickr panoramas !
The more than 100 equirectangular panoramas since I uploaded were taken with the above. So it has been well tested. Heiwa4126 who uses one kindly says "HaPaLa is great. I can take 360x180 HDR panoramas like snapshots."
Features include a strong (red) laser easy to see in the brightest sunshine (with an on-off switch at the end) and a simplified construction with plans which would seem to fit any slr camera,
This collage shows the positioning ring in use with two kinds of target.
There is more info about HaPaLas here.