Yes. I found it effective, even after I'd halved the daily dose to 40 mgs. Unlike metformin, the effects of which are cumulative, gliclazide works within hours. Over some 15 years of use, I was not aware of side effects, but some patients complain of weight gain.
Please be aware that gliclazide works chiefly by stimulating the amount of insulin produced by the pancreas. If insulin resistance rather than insulin deficiency is the principal concern, then gliclazide may make things worse in the long run. Back in 2003 when I was first prescribed gliclazide, this potential drawback was never mentioned. We now know most, if not all Type 2s, already have ample insulin circulating, so 'flogging' and 'dead horses' spring to mind. For this reason, I was advised to wean myself off the drug in December 2018.
That said, some patients have been prescribed gliclazide for more than 30 years without apparent effects to the pancreas.