I am very pleased with the work that ECUPro has done for me. After sending my unit in to test it needed replacement, they have offered me to purchase their replacement unit, but i request some time to purchase my own replacement unit and even provided me a list of models that works for my Mercedes CLK550. They were very patient to give me the extra time to find them my own replacement for programing. They were very kind to have me pay the differences of the cost of the programing service in addition to what I have already paid for testing. Their price is so very fair, and do a very professional job. It only took 4 days to get the programing done after I send in my replacement unit for programing. It worked perfectly when I plugged in the unit and the care runs like it should. I highly recommend ECUPRO to any one who needs their ECU repair or replaced.