Works well 99% of the time and is simple to use. Just plug into USB port and away you go. Documentation is very poor. The one bit of written information that WAS useful said if the software stopped responding unplug the headset and plug in again. Does seem to sort any problems.
I was taught grammar at school but I had forgotten more than I thought as I discovered when going through this book. It made me realise why German grammar can be such a problem for students who have no grounding in their home language grammar. Well worth having for students in the early stages of learning German.