A great product that saves time. Not having it will not prevent you from having the best viewing ever but it will take a bit more of your time to setup your telescope in the field. If you have cash in reserve and looking for something to buy to enhance your hobby then go for it as it is a great enhancement to your telescope if compatible.
ข้อดี: Reduce setup time considerably especially if you are using different viewing sites often.
ข้อเสีย: Added expense that could be filed under the 'nice to have but not necessary' category.
I did not buy it here but I'm owner already 2 years.This is simply best money I spent on astronomy equipment. I use it with AVX and SLT mount and it shorten my time to align GOTO from 15-20 minutes to 3 minutes when I can do other things these 3 minutes as process is automatic. Goto accuracy after use of starsense is pinpoint. When you buy it make sure you have latest firmware in SS controller and camera - updates are done via Celestron firmware manager here : http://software.celestron.com/updates/CFM/CFM/
ข้อดี: quick mount GOTO alignment
ข้อเสีย: cost only for GOTO alignment - can not be used for polar alignment of equatorial mount.