I have there account and working well with 25,000 GH/s purchased few months ago also use Hashflare which is for me one of the best and there I have around 18 TH/s purchased and around 5 TH/s from referral program.

If you are going on Hashflare i would like to you sign up with my referral: https://hashflare.io/r/BBB9C75F

Last months I found also EKEN which have really crazy prices and working very well for me there I have around 100 TH/s there and some extra with referral also you can there sign up with my referral if you want

https://eken.io/register/kokoko