Well I won't be buying it without the FMS, cant stand the Garmin GPS units and I don't own and never will any flight1 or RXP Garmin addons.
I wouldn't pay for the JS41 again and then pay out another $50 for a realistic GPS which still isn't realistic for the JS41, not posting this because I know it won't change anything just felt like I should voice my feelings for an addon that I spend 50% of ALL my flights in (the other 50% in the Q400Pro).