Considering a cover tester - Need advice please

Afternoon everyone, off on my holidays in a few weeks to the United States and unusually taking longer than normal away from the garage, so find myself in the position of considering a cover tester for a week or two. Having always been the only main tester on our system, I find it difficult to leave other testers loose with our customers in this period ( my trust issue's and nothing else ) and have researched a company called Autotech. Has anyone used this company in their garage for holiday cover or sickness ? 

I have been in touch with Autotech and received a standard terms of business contract ( unsigned ) but thought I'd ask for recommendation before following up with the agency.

Thankyou in advance and look forward to you reply, Paul.