Personally, I'm not a fan of Mynority's production/mixing and wouldn't want to pay for it but to each, their own.
Mixing aside, I'm with tomafd, if it doesn't cost you anything, it's gotta be worth a one time punt.You might 'luck out'.
Nothing has come of the 2 tracks I've sent and others I know have pulled back from their involvement with the duo but others may have better luck/experience.
Compared to Smashsongs, this duo are positively saintly.Smashsongs wanted $20 to vet submissions to pass on to a library. I told them what I thought of that !!