Does anyone know if these guys handle pre purchase inspections for German cars?

[ricardobravo]

Looking at buying a used A6 from a dealer in Sharjah and I want to get it checked independently before committing. The dealer says it's been through their own inspection but obviously that means nothing. I found www.alzaabiautocare.com while searching and it looks like they work on German cars specifically which is a good sign. Has anyone used them for a pre purchase inspection or know if they offer that service? I want to know what they actually check and whether they provide a written report I can use to negotiate. Also how long does it usually take and do I need to bring the car to them or can they go to the seller?