I have been using my upper thighs with the Medtronic guardian 3 since December of last year . It is very comfortable and easily accessible. The only reason it isn’t FDA approved is that Medtronic did not present it to the FDA as a recommended site.
I too had miserable luck with it in my abdomen.
But with the thigh site I don’t even feel it there. I don’t have any issue with clothing and it says on well with bathing suit, swimming and sun tan lotion.
My only complaint is the constant reminder to calibrate when it really doesn’t need it as the numbers are on target with finger sticks.
I don’t use auto mode as I have not had much luck with staying in auto mode. It also frequently left me basal deficient
Medtronic has a recall on their web site to change out your transmitter if it has a certain serial number. It is to better accommodate staying in auto mode
I just did that 2 weeks ago but have not retried auto mode yet.