Welcome Stewart,I know from my experience people can post reviews that are not true. Any person claiming Briansrentacar is avoiding return of deposit fraudulently should contact the Police.
From my experience i also know not the 100% of the reviews reflect the reality of a company, website or service. I dont know about Brians rent a car, never used it, so I can't give my opinion about them.
I always recommend to check reviews, but taking in consideration other factors like number of positive and negative reviews, what kind of problem the reviewer had? had many of the reviewers the same problem? and if so, would I be ok If I have it too?
I know of car rental websites with 98% positive reviews, and the negative ones warn other people not to use them, a big contrast...It is impossible to provide a perfect service for everyone, that's for sure. But at least we should expect the company to try it.
Well this is a not related post to Brians rent a car, but feel like posting it