Transforming from one to another company is composition of different steps like many web hosting companies provide a testimony page. Good web hosting companies will actually link to the person who 'said' what is posted. If there is no link, it is possible that the hosting company simply made up the testimony.
Testing out the response of a web hosting company is easy: email them. They should provide an email address or at least a feedback form. Ask a simple question about their service, and see how fast they respond. Compare that with what they have 'advertised' as their response time. See how they measure up. Some hosting companies may even offer and online ticketing/helpdesk. While you may have to be a customer to actually use it, just the fact that it is available is a good sign.
Honest web hosts will be open and quick to resolve them. Many hosting companies now offer online forums - a place for their customers and potential customers to post questions, comments, testimonies, and complaints online.
So these steps can surely help you to understand a transformation.