For me it's not erector travel, or even tracking. Just want them to hold zero. Learned I can't trust zero until proven by a couple more range trips. Needless to say tested those we use. Slowly replacing them with......well, you know.
OTOH, friend just returned from muley hunt. Leupold VX2 shifted zero, made for some lousy shooting. Tempted to just gift him a 6MQ. But he likes variables.
