I am one of those that loves to keep things as accurate as possible! I am a Type 1 well controlled and rely on readings for dosing of insulin and sometimes that is small correction doses with my pump. I have the Contour and 2 Verio One Touch meters that I have compared numerous times. The Verio's have always been only .1mmol (1-2 mg) points different than the Contour. And I compared the Contour to an actual lab blood test and it was within ,2mmol (3mg). I have a Libre meter/reader and an Accucheck and they have never been as close, I don't believe they were necessarily way off, I just don't remember and I don't use them at all after testing them a few times. I also like to keep my Dexcom calibrated within .3mmol (5mg) of my Contour/Verio meter at my preferred range.
If you are a type 2 not using insulin for corrections and meal dosing I expect that small differences wouldn't really matter. My husband who was diagnosed with type 2, but stays in the low 40's now and only takes metformin uses an old One Touch meter that is off by more, but for his purposes it's fine, it lets him know if he's high or not when he checks. I've offered him newer meters, but the old one for him serves it's purpose.