I use both too. I am very hypoglycemic unaware, so my lower alarm on my Dexcom is set at 90 for safety. I have had both units about 2 years. Both units, especially the Dexcom unit, helped me as soon as I started using them. I do feel that it has taken more than two years to get to the point where I am optimizing their use.
Please be very careful about doing correction boluses with the OmniPod. The insulin on board amounts exclude insulin taken for meals. Despite knowing that, I got myself in trouble this week. I was 190 two hours after breakfast and took a correction bolus. In the space of one hour I dropped from 190 to 90 - not a great feeling. I continued falling to 50 - 60.
I am working with a CDE to fine tune my pump settings. We are working on my basal rates now. It requires skipping meals (not fun), but it validates or invalidates the basal rates. Right now I have six different rates over 24 hours. Once we get the basal rates correct, then we'll move on to testing the insulin to carb ratios and finally finish with the correction factor.
My A1C is 7.1 and my endo doesn't want it much lower because of my hypoglycemic unawareness. Despite not changing from last quarter to this quarter, I am in better control. The previous quarter I had highs and lows which averaged out. Now my readings are much tighter.
I am a big fan of having a good CDE if insurance pays for self management education. The appointments I have are much longer than those I have with my endo. I would not be nearly as successful with the fine tuning if I were trying to do it with my endo - the appointments are not long enough to be able to analyse the trends on the Dexcom reports.