I am a beginner and bought this to make sure my scope was set up correctly.
The slight problem I had was that the batteries supplied where dead but when I was able to buy new ones it worked very well.
ข้อดี: Well constructed and very easy to use.
ข้อเสีย: Maybe the led is too bright ( new batteries ) .. would be nice if it could be adjusted.
Great set of LRGB Filters. Note that the focus needs to be adjusted during filter change to attain best focus. So you need to pair this with an EAF(auto focuser) or manually adjust focus all the time.