I like some, quite a few even, products marketed under that brand. I dislike others.
Like: Tenergy 05, Sriver-L of yore, Dignics 05, Dignics 80, SpinArt, Rozena, Viscaria, Innerforce ALC, sweatbands, bags, polo shirts, CentreFold 25 table, "Elite Clip" net set, most of the Lazoline shoes.
Don't care: Quite a bit - Tenergy 80, Tenergy 64, Tackiness C, Roundell.
Dislike/disappointing: Sriver-S of yore, Sriver FX, Tackiness D, Bryce, Bryce Speed, Tenergy *-fx, Innerforce ALC-S, Viscaria Lite, Freitas ALC, Harimoto ALC, all balls, glue, towels.
If we're going to compare "brands" by comparing the products marketed under that brand name, GEWO is actually doing better than Butterfly for me. I haven't seen anything sold as "GEWO" that really disappointed me, whereas
many of the GEWO products exceeded my expectations; blades, clothing, shoes, glue etc. fit that pattern.
In a head to head of BTY vs GEWO by way of a product catalogue mano a mano I'd choose the latter over the former, then. Using the same comparison method, I'd probably go with Nittaku over Butterfly too; and Butterfly vs. Yasaka, Xiom would be a tie, or close to a tie.