I manage 5 client's site with their webmaster, and we used Ahrefs also to report our clients about keywords and search performance.

But since Ahref's updated their volume calculation program, I see the update is almost wrong for I can say 80% of keywords volume is nowhere close to the real volume.

I would request Ahrefs to revise their calculation, and keep it smooth. Our client's real search traffic is around 2500-3000 while Ahrefs showing 500 (previously it was 7K) and that 500 is also going down day by day.