I used the RS800 and found it was very reliable and durable. I had it for over a decade and never had an issue. The manufacturer offers a trade-in upgrade promotion for people looking to get the updated version that works with a mobile app. It has the same level of ruggedness, if not more but comes with an easy-to-use app. They still continue supporting the RS300 as long as the Windows/Microsoft technology allows them to do so. If you want more specific details, I recommend contacting Nathaniel Webber at RadonAway. He is the go-to person that can walk you through what makes sense for you. (978) 469-8567 or NWebberatsprucedotcom.