I have had this Dexcom for 9 months now...and he sure does like me. Since getting him my A1C's have been 6.0, 6.1 and 6.0---- prior to Dex I ran btw 7.0 and 7.3 very consistently.
I am convinced that never staying high for more than an hour or 2 (of course there is the occasional all night long at 200), and my ability to target 100 durning the night without suffering severe lows has contributed to my success.
I also know that i have changed my habits greatly since Dex arrived...bolusing long before i eat---25-40 minutes, and being somewhat successful with the combo/dual wave bolus.
Finding this site didnt hurt anything either...i know since coming here, i have learned many many tricks of the trade and put them to good use. One of the best for me has been, treat all lows with glucose tabs, then wait 15 minutes---this provides me much better results than sitting down with the box of Fruit Loops and eating until the low symptoms are gone---then 3 hours later hitting 500+.
I am by no means a perfect diabetic(as if there is such a thing)----i still hit 300, 350, 400. I still have days where it seems no matter what i do, i cannot get below 180---and other days that seems like i cannot get above 80. I still hit 40, (but at least i get a chance to head if off). I forget to bolus. I forget to eat. I under bolus, over bolus, and make down right bad decisions at times. But overall, i find that i do this less and less and that is where i think the biggest difference is.