Not Perfect but definitely legitimate
Whilst BFF are not perfect by any means they are legitimate (they are Nasdaq listed) and not a scam, Most of the negative reviews here are unfortunately because people don't fully understand how cloud mining works and are over optimisitic about getting free money. Upfront you buy your hashrate and 10 days electric. That is not the end of your investment. If for example you buy a 60 day plan, you still have 50 days more electric to pay for. either out of earnings or adding funds. The output is not guaranteed as BTC difficulty changes over time. Some plans are only profitable if BTC rises in price. Like any investment you need to do your research. Everthing is mined on 3rd party reputable mining pools and paid to your personal wallet. As anyone who uses BTC knows there are network fees to pay on any transfer, that is just a fact of life and nothing to do with BFF. Because of the fees, as a few reviews mention it is rarely profitable to mine with very small sums (it will cost say $10 to transfer $9 or $900. You need to do the maths and invest wisely, not every contract makes money and there are no guarantees but it is 100% legitimate platform