On the whole I've found them to be hit and miss.
For example the night I had a blowout and found the wheel had galvanically welded itself to the hub when I tried to change it.
The guy Volvo sent to help decided to persuade the wheel off with a hammer - ruining the rim. However after sending Volvo assist the photos they arranged to replace the wheel.
Or the time when one of the brakes seized mid-journey, despite my telling them what the issue was they sent a guy out who tried to reset a seized front brake caliper with an OBD tool - before deciding that yes the brake was seized and my car needs to be recovered - only that his vehicle wasn't big enough to do the recovery leading to a 3 hour wait for a bigger truck. (but again they redeemed themselves when the driver that came to take the car to the Volvo garage brought the parts with him and fitted them on the drive as it was quicker.)
For example the night I had a blowout and found the wheel had galvanically welded itself to the hub when I tried to change it.
The guy Volvo sent to help decided to persuade the wheel off with a hammer - ruining the rim. However after sending Volvo assist the photos they arranged to replace the wheel.
Or the time when one of the brakes seized mid-journey, despite my telling them what the issue was they sent a guy out who tried to reset a seized front brake caliper with an OBD tool - before deciding that yes the brake was seized and my car needs to be recovered - only that his vehicle wasn't big enough to do the recovery leading to a 3 hour wait for a bigger truck. (but again they redeemed themselves when the driver that came to take the car to the Volvo garage brought the parts with him and fitted them on the drive as it was quicker.)