I maintain a 3 star review. Because I do not recommend against it!
Mamba is low cost site, where you can meet real women. Unfortunately in 2018/2019 site implemented new policy by which you have to pay credits to contact women if you are outside specified desired age group.
This really make the site less relevant for a lot of users. Before, many women did not have specified age group. Now the site has incentive to enforce it, because that is a cash cow. Still I reckon you can get dates there. I have tried it in the past. That woman is now married outside her home country!
Downsides are that there is a lot of scam on site. Its the wild west. It takes a lot of effort to find women. This is not just because of scam aspect but also because competition is higher. More men can join, men who can not afford real payment sites. Men who are not really sincere, perverts, etc. Similarly any woman can join. You can expect that many women are not really clarified about an international relationship. They have not made a very clear decision before signing up.
Avoid women resident in non-FSU countries, like USA. Avoid profiles with porno type photos. Avoid profiles that switch location all the time. Ask for facebook. Scammers have many men in their friendlist! Possibly ask for webcam.