A resounding yes for me my Hb1ac was nearly always in the 90s now in the low 50s , the job I was in didn’t help in the taking of blood sugars ( heavy industry long very busy shifts) so it didn’t happen as much as it should have or even at all . Such bad control for so many years does have a knock on effect, for me it was heart attack , and loss of leg .sounds terrible but I’m still here , since I’ve been using the libre control is a million % better and the risk of complications.vastly reduced , yes you hear it’s not as accurate as actual blood tests but it definitely helped me , it’ll never be accurate to control your blood sugar to the 0.5 of a mm /mol but hey if your wanting that tight a control your doing nothing else but taking your blood sugar ! Sorry but I need to live also