Bahco North America was a division of Snap-on Tools, and a brand of tools up until Jan 1, 2007 when Snap-on launched the J.H. Williams Tool Group.
Bahco North America no longer exists as a company, but only as a brand within JHWTG.
JHWTG is the distribution arm of Snap-on Tools. The business model is to sell industrial tools via distribution (Motion Industries, Hagameyer, PTS etc.) rather than via franchisee (Snap-on Truck) or direct sales (Snap-on Industrial).
The JHWTG line consists of J.H. Williams Hand Tools, CDI Torque Products, Bahco Tools, and Milford Band Saw Blades.
The quality for the tools range from good/better/best.
Good - JH Williams "Global" tools. Any Williams tool not marked as "Made in the USA" falls into this category. The tools are made at various offshore facilities to Snap-on Specs. These tools are designed to offer a quality tool at a lower price point.
Better/Best - There's a lot of interchangeability here between which Williams tools is better than Bahco and vice versa. The Williams Tools in this category are "Made in the USA" while the Bahco tools can be made in any number of global facilities in UK, Sweden, Portugal, Spain or France. I know I'm forgetting some. These are high tech facilities and in most cases I believe they are union shops. The Williams tools are very rugged and high quality no nonsense industrial tools. Bahco Tools feature some interesting ergonomic features and tend to focus more on "tradesman" (Plumbers, Electricians, HVAC Techs etc.)