@SmileTomato, yours is a rather vague and open-ended question. There are large numbers of threads on people’s experience with G5 and G6 transmitters on this site. Why don’t you do a search and have a look. There probably are 300-400 threads on the G5. Here is one on the G6 that describes the problems people have:
One example of how you can go through a lot of relevant threads is by looking at the /Categories tab, and looking for the c/gm subcategory which has the majority of the Dexcom threads.