Hi Annie i have been diabetic for about 30 years and on a pump For 3 and a half, last month i changed my pump from Animas vibe without cgm to medtronic 640 without cgm, i researched the cgm s but found the cost to much but went for the freestyle libre , the first 24 hrs needed to settle down but the second day was giving very accurate results compared with my Bayer contour link glucose meter ,so i am now very confident to spend the day without pricking my fingers useing my glucose meter,the cost is much less which works out at 120 euros a month as i live in france ( about 95 pound ) , I do about 1 check per day with my Bayer meter just to see that alls ok, so i hope my experience with the libre will help you to decide .