I have the Ultra Four 30mm. About the only time I use anything other than the 4moa dot is when I am in realy thick brush in brown bear country. At that point I crank up the dot size so I can pick it up instantly in an "Oh crap" situation. Some lighting conditions it's nice to go up to 8moa dot & reduce the brightness, but that's more of a luxery than a necity.
Not sure if I would order the same thing again or get the straight 30mm with the single 4moa dot.