well everything that needs to be said seems to be on the first page, the bottom line is that midcaps are more reliable - but a little bit inconvenient.
The factors that make them inconvenient are:
-only 100-150rds per mag
-a bit tough to reload under fire (if your situation calls for it)
-need to be realistic with your trigger finger, only fire when you have a target within engageable range
-midcaps require a somewhat thought-out tactical load out, you need to have them within accessible reach, but you also have to balance it out with comfort/functionality etc
If you can deal with those cons, then I would definitly say go mid. Big ops usually require them, and I think the pros outweigh the cons. when you experience hicaps misfeeding, not winding, or ceasing to work altogether (while in the field), you will never want to use them again. you can't exactly take apart the mag while playing, without losing your ammunition... :lol: