i wear vivobarefoot, lems, xero shoes and carets for dress shoes. i can’t put any of them in the bifl bucket. Xeros wear out quick, vivos soles wear out for me too quick and can’t be repaired, lems held up better for me than the others. Carets are great for minimal dress shoes that don’t look like clown shows, and they used to have resole program putting it in the bifl category for me, but from 2018 on they discontinued the resole program so again can’t put them in bifl category imo. In terms of bang for buck - vivos are great but $$$, lems and xeros are at least cheaper, and carets are super pricey but for dress shoes that serve a purpose looking professional in that environment, they at least offer value in that sense so they pay for themselves imo.