It's worth mentioning that in Canada, you do not require a prescription to get a CGM. However only the Abbot Freestyle Libre series is available here. It cost ~$100 and last 2 weeks.

I've found it to be mostly accurate.

Placing it on the back of the arm was always a problem for me, it was constantly getting knocked/pulled, and otherwise disturbed. I had to buy adhesive patches that covered the entire unit. I later discovered that another decent place to apply them in on my chest between my collar-bone and shoulder-joint but lower (towards the nipple). I always had decent reliability/accuracy there. It also hurt less (from the adhesive) then on the back of the arm.

Having a CGM is amazing, and if you have medical coverage that will pay for it then you should get it.