I have used the Collings one for over 30 years and they were around well before before that even. The mainstay of full bore shooting in NZ.
When shooting with apertures (and scope for that matter) because of the leg design you can set them right up close by and with an offset lens scope you only have to turn your head slightly to look thru it. I also have a long eye relief lens in my Kowa which makes it even better. No moving/losing shooting position to view.
The only downside (I find minor) is they have a friction setup/join for adjusting elevation which is not a problem once you align with the target. Mine tends to be a bit notchy now when I adjust but again once on target all OK. Years ago I did see a Collings type with a screw setup for fine elevation adjustment but none since. Possibly the owner had modified it.
The legs fold around on themselves for reasonable compact storage. Their design makes them very stable as well. I have also seen them with a weight attached to the bottom of the vertical rod to make them even more stable. They also come with extra vertical rods so you can use them sitting in a chair or standing. Probably would need the bottom weight in this mode.
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