The biggest hurdle I see at the moment for any KIT supplier is sheer cost. Very few people would pay AUS $100 for this, when they know they can go and buy a top notch multimeter with all the bells and whistles, which possibly includes a USB interface, all for about the same amount of money. Frightening stuff knowing that I can go and purchase a brand new 10MHz oscilloscope (with full warranty) for under AUS $130. DIY test gear is history.