The magazine release doesn't feel well thought through. I've never accidentally dropped the magazine at an inconvenient moment but I'm always aware how easy it would be to knock the release and accidentally dropping the magazine.
Although it may be more a fitting than design problem on my rifle, if I have the bolt closed on an empty chamber, the magazine locking mechanism will not always engage when the mag is inserted into the well. To get positive engagement of the magazine locking mechanism I have to open the bolt.
It possibly isn't the best system but as long as one is aware of the issues and takes sensible precautions, one can live with them.
I adopted a "tacticool" elastic band solution to make sure the magazine doesn't drop out. Not necessarily the best solution but it works for me, albeit one that leads others sometimes to ask if my rifle is held together with elastic bands.