I briefly worked for a TNF store in London in 2005, where it was a "cool" foreign brand, at the time. Most of our customers were London yuppies looking for glorified rain gear to wear during the morning commute. However we did get regular Himalaya expedition teams coming in and raiding all the base camp bags, which at the time were known to be top-tier, and might still be. I think the expeditions also sometimes bought the high altitude down suits. The TNF gore-tex jackets were mostly for the yuppies.
I think my least favorite aspect of the brand is, the size of the brand on items. Sometimes its absolutely massive, making it look kinda like the RL polo or LV of outdoor gear. Tacky.