Just remember with the viper ALL info is stored in RANDOM order ( the order you input) it's a ROYAL P I T A ! ! !
It does have some nice features but the random order thing overshadows them all.

Would NOT buy another , don't know if the envisio does the same .

It's not very user friendly , AVERAGE input(clicking/scrolling through) is 89 steps for EVERY field. That's IF all info is already in viper.

Yes , I've counted MANY times , how many button pushes it takes to get every thing setup , spray average of 7 customers a day , 18-25 fields .

Only thing I don't have is the auto weather station , do those 5 manually.