I've been an Oura customer since 2019 and recently upgraded to the Gen 4 ring. I use Oura primarily to track my sleep stats and menstrual cycle - as it gives a continuous reading of your body temp overnight, which women can use to understand changes in their basal body temperature. I recently experienced a fault with my Gen 4 and had to contact the customer service team, who were polite and supportive in their communications and resolved my issue very quickly. Love Oura - this is the superior sleep/cycle tracking product on the market and what a relief the customer service stacks up to the product.
