I have been away with Atlas (Peter, Jo and Carrick) several times several times and can not recommend Atlas Overland enough.
My car broke both times and it did not disrupt proceedings. 'Never leave anyone' is a Atlas principal. We took the inlaws last time (never driven off road before borrowing our 'spare' 4x4) across Morocco and they had a great time, as first timers to this type of holiday.
We are repeat Atlas customer as were several people on every trip. You leave the trip as friends not customers!
The bad bit is last time
I went as a Landrover owner and came back a LandCruiser fan