Adequate for most range-finding/compass uses - but not a classic viewing optic. 1) Slightly larger than desired - but consistent with aperture. 2) Would prefer 1-mil tick increments to the 5-mil increments it provides (makes the math/estimation a bit more challenging). 3) Would prefer 360 degree field of view: Note: field of view is much less than 360 degree, since the bottom 1/5 is blacked out to show the compass. A full field could have been obtained by using a smaller compass window aperture - which means this is not a viewing optic. 4) Aperture cap is good construction - eyepiece cap is common string - replace with flexible wire ASAP! 5) Solid, waterproof, stable 6) Large 6-millimeter exit-pupil is nice - don't see that on most monoculars. 7) Compass reads in degrees only - no direction mnemonics. 8) An optic you won't be afraid to knock-around in the field.
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