The mid-2010 Mac mini officially supports up to 8GB of DDR3-1066 RAM; but it does run 16GB DDR3-1066's -- it doesn't, however, support higher clock speed modules.
As far as G.Skill as a brand is concerned: they aren't "unknown". They have a solid reputation for performance products. Sure they don't have in-house memory IC's (ie: Crucial/Micron, Kingston, Samsung, etc), but they are hardly considered an "unknown" brand. But I digress...
OWC offers 16GB DDR3-1066's that work in the Macmini4,1's at a $50 premium (http://eshop.macsales.com/item/Other%20W...).
My set are using SK Hynix H5TQ8G83AMR-PBC. Judging from SK Hynix's product coding convention, that "PBC" part indicates it's a DDR3-1600 @ 11-11-11 timings; however, the modules are apparently clocked as DDR3-1066 @ 7-7-7 timings.