Because of all the differences, the best way to measure 'gears' when comparing bikes and trikes is to use "Gear Inches". The lower the 'GI' the lower the gear.
The Rover8 has a GI of 24-80 - I wish the 24 was a '20' instead (I am not a strong rider) The 'ideal' trike with have a GI of at least 18-90 (or higher, if you pedal going downhill). 24 gear inches is OK if you aren't doing *big* hills...
I *would* buy the Rover again.