The MTek guys have been fantastic. I had them come fix my car at my house which saved me the hassle of getting the car to a shop. It was way more convenient and in the end I saved money too. Since then I've had them come back to take care of sidewalk and driveway repairs. Both of these jobs look great.
Xbox 360 repairs are guaranteed up to 30 days for Red Ring of Death. As for Disc drive I will give a 90 day guarantee. Computer repairs have a 30 Day guarantee due to the fact I have no clue what you are accessing after I leave.