I just want to share, even though it is vw related, same applies. A guy with a copy of vag tacho and vcds, neither genuine, who has done a few eeprom edits to add miles to empty and lit needles on a mk4 golf, decided to offer help to a guy wanting a cluster upgrade. Just like our older A3s, a new cluster will give added features including the addition of a half or full DIS. Quite an easy job and fully documented on rosstechs website. So, a clone vag tacho tool is only good sometimes for reading the eeproms and obtaining SKC codes. I would never advise writing with these tools. When things go wrong there is no support. Clone of vcds, same applies. When things go wrong rosstech will help and advise if you have a genuine tool. I have never used a clone VCDS, and never had an issue of it failing. I have used a clone vag tacho, its very hit and miss compared to genuine. Anyway, the mk4 golf drove to this guys house fine, and just wanted to have the cluster swapped. 6 hours later the car wouldnt start. Next day the guy with the tools ordered some new transponders. God knows why, just shows incompetence IMO. Three days later customers car still immobile on the driveway. I have been able to assist in getting the car mobile, and i will be coding it correctly in the near future. I just wanted to share this to warn others of the dangers of using counterfeit tools on other peoples cars with no support or knowledge for when things go wrong. This is also why only genuine VCDS users appear on the map on this forum. Lets hope this prevents others being inconvenienced.