It may be just me, but when I use them (fairly often) it seems to matter which end of the strip I'm looking at; ie, in reality it's, imo, more like 4 aiming points to choose from. I know it probably really doesn't matter (I'm not that accurate), but it "feels" different.
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"I do desire that we may be better strangers." Willie the Shake, As You Like it(III,ii)