Yes, both Bit X and Hashenst are legit and backed by real hardware. You just need to devise a good reinvestment plan to counteract diff growth and hope for this growth to stay moderate until you actually reach ROI.
Can one resell GH/s on Hashnest, like on BIT-X?
You can sell hashrate at market unless you got that new pacmic contract. After they updated their website it looks quite good and clear I should say, at first it was a bit clumsy though
Good work for them.