Can’t see the point to be honest, it is too easy for them to go bust. My recommendation is always pay by a credit card, Solicitors will take your claim on - offering a No Win No Fee.
Our case is still being investigated, just avoid companies that work out of a car boot, if they have business premises you know they have made a commitment, check their history, ask to see all qualifications, also check clients feedback.
Hope this helps you make a good Choice