I do in fact carry mine all game (woodland games 2-3 hours long), because i only carry 3 midcaps for weight reasons (mild sciatica can hinder me if i stack lots of mags on my rig due to weight on the spine and all that) and need decent speed reloads in order to keep up.
Some people keep their Odin's at the safe zone but they carry like 8 midcaps and 2 hi caps spare. Which is a lot of bbs in stock to use.
As for sounding like a maracca, its not as bad as you would intially think (it's 1 rattling box, compared to 3+ rattling boxes...) Best option is too move slow. Which is easy enough in woodlands, but with it in my admin pocket the noise is further muffled by the smock and the rig holding it down... Its still loud as i start to run out of bbs in it, but never been at the point where its given me away.
As for CQB i haven't tried yet so im unsure if ill carry it with me.
Its just my preference since im limited to how many mags i can carry on my rig at once, as well as the fact it carries more bbs in less space and weight than hi caps. Which is good for my back and good for long games like at my main site.
