I have used startarg for a while now and think it is great value at $20. It is an overlay for live camera image that comes with onboard instructions. The real key to using startarg is to initially make quite agressive moves and once you have the alignment close move to more fine adjustments. Only takes me about 10 minutes to get an aligment that allows imaging for a couple of minutes without significant star drift.
Love it....
Cheers
Doug