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The 40049 is the HD-B version which offers more than the HD-R:

Using an array of built-in sensors, this electro-optic measures the ambient atmospheric conditions as well as the shooter's angle relative to the target. By compiling data from the laser rangefinder and environmental sensors, the ballistics computer will calculate several values that can help improve shot placement.

Leica's Advanced Ballistic Compensation (ABC) technology combines temperature and air pressure readings with rangefinder data, zeroing distance, and user-defined ballistics curve to calculate ballistic compensation values. To maximize the accuracy of compensation values, the Geovid HD-B allows the shooter to input their rifle's zero distance and select a ballistics curve corresponding to the chambered round. The HD-B is pre-loaded with 12 ABC ballistics curves for various calibers and weights, and alternative ballistics curves can be stored and uploaded using the included microSD card. An in-view LED display allows the observer to view the calculated ABC values without taking their eyes off the visual scene.

Advanced Ballistic Compensation
Equivalent Horizontal Range mode calculates horizontal distance to target
Point of Aim mode displays the holdover compensation in centimeters
Impact Point Correction mode calculates elevation adjustment in MOA / MRAD clicks
Inclinometer measures the shooter's angle of inclination relative to the target
Barometer and thermometer measure ambient atmospheric conditions
Zeroing distance is programmable in 100 yd / m increments
12 pre-loaded ballistics curves corresponding to load caliber, type, weight
Alternative ballistics curves can be stored and uploaded using the microSD card
ABC values are derived from the set zeroing distance and ballistics curve, atmospheric readings, target's angle of inclination and measured distance

If you're a techy guy that will take advantage of all of these features then yes it pays. If you're a "set it and forget it" kinda guy then the HD-R is the way to go