The price is over the top for what they are doing
Slotted t2 rotors from DBA are $400 or less for the pair for the rear
Bendix Euro+ pads are $80 for the set
Labor is max of 1.5 hours per side, IMHO should be 2 hours total (would take me sub 45min for both sides on a hoist with my tools)
The DBA rotors & Euro+ pads last 2-3x longer than factory stuff
No factory tools or software is required to do the job, having access to the volvo software does save ~7min by not having to manually screw in the electric servos but thats it...