Legrand fan regulators (not sure of the exact model) installed in my aunt's house die almost as soon as they're installed and cost a bomb (300+). Basically you end up with off and full speed. This is in kerala so not sure if they're extra sensitive to the crappy electricity there. But GM seems to work well enough and is reasonably priced. Have never had good luck with most anchor products, especially Roma in the last 2 decades.