I have Ginghers, Kai's, and Havels.
The shears I use most are the Kai Cutlery brand. I've had them for 10+ years and never have had to have them sharpened. The Ginghers are also very good.
I have the Havel curved blade Snip-Eze snippers. I use these constantly and absolutely love them.
I really believe in investing in good tools. They make all the difference.