There are better modules in terms of functionality and can be cheaper but I needed this fast, that's where Mick's Garage exceeds itself as one of the most expedient & efficient online shops in Ireland. Super fast delivery, couldn't fault it. The module itself will do what you need it to do, i.e. it will give you a rough picture of what the problem is with your vehicle and you will be better armed when dealing with a garage or mechanic thereafter. You will also be able to clear the codes but this is negligible unless resolving the actual issue at hand.
I used this to diagnose an engine check light on a 2012 Mk6 Golf (2.0 TDi) but be forewarned that there are certain modules that this machine is unable to detect (airbags and some others I believe) but it's not likely you'll be shopping on here if you need a device that's that advanced!
For quality & price, 5 stars..