From my experience when i bought a goldshell miner and then sold it a few month later, i think i won the deal compared to the guy i sold it too. i made a pretty good profit while the return for sia coin with the hs5 miner i sold is going down. I am not sure he will be able to make his money back with the miner. So yeah in my case id rather just buy bitcoin than mine it but each to their own.