I was looking at this kelty (https://www.amazon.com/gp/product/B014JQIKRA/ref=ox_sc_act_title_1?ie=UTF8&psc=1&smid=ATVPDKIKX0DER) but im slightly worried its "too good to be true"

I dont actually expect to hit 0 degrees but i want to be comfortable in the 20s. Its better if it is a backpacking one but its not a deal breaker. My reservation on the teton brand was that my thought was id rather get a slightly better brand (kelty) at 0 rather than one that says -25 but might not back it up

edit: willing to bump my price range up to 170 but thats a super hard limit