Since recently purchasing a BMW X5 on an 05 plate, I was frustrated by the SatNav not working properly, by not reading the map disc. I found Revtronic on the website, gave them a call and they immediately reassured me that they would be able to fix the problem. Within a week of getting my unit sent up to them, it has been returned with new laser and unit checked over. It now works perfectly and I have to say what a great service by a team who know exactly what they are doing. Well done!!