I have them, mostly as they produced a WW2 supplement – A Clear and Present Madness. I was re-reading them only last week! I like the mechanics and have moved into the top 10 of rules I want to give a go of this year. Of course, having playing nothing for the last 3 months, playing anything at this stage seems ambitious 🙁
Do you want to know anything? Having a look at the QRS on their website should give a good idea on what the mechanics are.