While my car was being repaired after an accident I had a hire car from Drive Assist. A couple of things about the process worried me so I googled Drive Assist and was horrified to see all of the negative threads on this site and others. I spent the next few weeks feeling very worried, but in fact we had no difficulties with them. They delivered the car promptly and collected it the same day that my own car was returned. We were very careful to return the car in a pristine condition and with the correct amount of petrol in. The driver was very pleasant, checked the car over, then had me sign a screen confirming that there was no damage, the car was clean, and the fuel was fine. A short while later I received email confirmation of this, and was very relieved that I had not been subject to the difficulties that others have reported ie false claims that the car was dirty or damaged or out of fuel.
I've taken the trouble to post this so that other people who have had to use Drive Assist will be careful with the details & car but will not spend weeks worrying themselves sick like I did.
Given that using Drive Assist leaves you potentially liable to pay hire costs yourself I just have to hope now that they can recover the costs from the other party's insurers. And if I ever have another accident I will ask for a car from the garage or from the Insurers so that I am not at risk of having to pay the hire charges myself, which is unfair as I pay extra on my policy for a guaranteed hire car.