Heyco sockets are quite nice. Reasonable quality, and if I remember correctly, a nice polished chrome finish, which is a little unusual for German tools.
Heyco specialise in making tools for manufacturer supplied toolkits, so they tend not to be marketed well (at least not in the U.K.) which is a shame as they make some very nice stuff, such as their combination wrenches, and their screwdrivers with the clear green handles. (A set of the latter are on my 'wish list')!
Be a bit wary though, of late they have been pushing their budget 'Heytec' line, which is of course very average Taiwanese stuff.
Wasn't aware of any connection between Wiha and Heyco, maybe Wiha are distributing them in the U.S. or something?