There space a couple of things that folks might want that they are not walk to acquire in the DC 40.....The two huge things that didn"t readjust are battery life v the fastest upgrade rate and range. So much we haven"t seen any increase in these and also I am not sure we room going come in the close to future.Battery Life - i think the biggest issue with the Astro is battery life. Us get approximately 17 hrs of operation time through the 5-second update rate. The concern here is the if you lose your dog at the end of a 10 hour day, you have actually 7 hrs to find him prior to the battery goes dead. That"s a small tight because that me.The point to store in mind right here is that in mine 4 plus years of working v the Astro, I have yet come be put in a situation where I could not locate my dog at the finish of the day. That does such a an excellent job, that ns have always been maybe to uncover them. That still comes to me, yet I am not sure it"s as large of an problem as we think.The DC 40 has included the choice getting an ext battery life through a much longer update rate (up come 2 minutes in between updates) but I to be not actual sure I will certainly go that route.Range - more range is always better, but the MURS band the the Astro functions on has it"s limitations and right now Garmin is hitting it. If girlfriend were no happy v the DC 30"s range, you will not it is in happy through the variety of the DC 40. Ns am pretty pleased with how the 40 is doing yet you should be realistic about what your requirements are when it comes to variety and understand that the Astro may not be the appropriate product because that you.In my opinion, that works great for many folks in most situations. People that require extreme variety (more 보다 3 come 4 miles) could need come look at to run telemetry and the Astro in ~ the exact same time.If you room not sure, then feel totally free to try one out under our 30-day money-back guarantee. The beautiful thing about the Astro is that it is straightforward to use and easy to test. Friend will recognize really quick if the is the best product for you.I would prefer to allude out the it is rare for united state to recommend any type of other tracking system for the majority of our client at this time.