television: Samsungs
Home theater amp: Onkyo
speakers: Paradigm
vehicles: Volkswagen/Audi
car tires: Continental
cellphone: blackberry (yet I'm using a Sony Z3 and an iphone6 as my daily drivers for personal/work respectively)
film: Kodak
Cameras: Pentax
lighting: Profoto
lighting modifiers: Elinchrome
watch: Tissot
SD Cards: Sandisc
batteries: Duracell
computers: MSI
guitars: Gibson
guitar amps: Orange/Vox
gaming: Xbox > Sony
Toothpaste: Crest Pro
Shoes: Merrell
really I could go on forever. :P
I'm pretty loyal to my products, and lot of it has to do with strong research I do before I buy. and I think that's for most Pentax owners...after all aside from Legacy users I'm sure a very large portion of Pentax users went with the brand due to researching products.
like others there are many brands I avoid... and most are due to personal experience. I for one will never buy a Kia or Hyundai after working for them. I'll never buy another Apple computer (suffered through 3 years of that OS....yeuck). I'll never buy another Ford after the pain and suffering of my Focus or my aunts 2014 Escape (exception would be a Ford Raptor). I'll probably never ever buy a Canon. Couldn't see myself purchasing a Samsung cellphone. yes, I'm opinionated.