I haven't paid attention to how frequently the MX 200 updates( it was around every 5 minutes with the 20) but I will look next time I fly. Of course I am always VFR and use it more as a flight planner than anything else. It is helpful though when navigating a cell to know what is behind the weather you are seeing. Interestingly the other day I was painting these well formed cells( dark green/yellow) going across the state yet never encountered a thing. Another pilot I know was at my destination and reported getting the same returns. Wasn't ground clutter..must have been a glitch in the system.
Granvil Tracy
2000 Vantare XLV45, S-2