Awesome product! It worked perfectly with my Celestron 8SE telescope using the stock handset. Plugged it in and set the Time/Location setting to GPS and it was spot on accurate in about 30 seconds. One thing to note, I tried to use this unit with the StarSense handset and it thought it was 2012! My StarSense experience was bad before trying this unit, so my guess is that it's the StarSense piece and not this one, especially since it works perfectly with my stock handset. If you are tired of putting in the date And time information every time you use your telescope and tired of having to look up your longitude And latitude when you take your telescope somewhere else, then this is a solid addition. Love It!