I love the look and feel of the #1. Having said that, there are a few idiosyncrasies that prevent me from owning a bunch of them. First, and by far the most important, is that there was no reliably safe method to carry the rifle in a loaded condition, if my example was indicative. It had the habit of moving the tang safety from safe to fire while carried slung. This became somewhat disconcerting after hiking across rough country for several hours, only to find that the .416 Rigby muzzle just behind my ear, or pointed at my companions legs when I carried it muzzle down. When I tried to carry the rifle loaded but out of battery, the weight of the falling block would cause it to drop and decorate the tundra with expensive Rigby ammo. This issue finally drove me back to a bolt gun that I could carry with a loaded magazine and an empty chamber.
Another issue has to do with the scope mounting options on the #1. I've heard owners of small bore examples complain they cannot get close enough to their big power, critical eye relief scopes. My problem was opposite, in that I was afraid of being hit in the head with the scope's ocular, driven by the .416's enthusiastic recoil. My solution was to have a custom quarter rib made, inletted for Tally QD rings, that placed the ocular even with the forward edge of the falling block. That worked out pretty well actually, the 1.5-5X Leupold was quickly acquired at low power, and although I only had enough eye relief to use it up to 3X this was enough to make hits with ease out to 300 yards from prone, without having to worry about a bump on the forehead.
Despite these issues, someday I would love one of the smaller versions of the #1 chambered in 7X57 and topped with a low power variable scope. That to me would make a very nice package.