Is it safe? I think so.
Is it effective? I think it has only a 70%-80% reduction of the hospitalization cases. So it's not as effective as the mRNA vaccines that have a 90%-95% reduction of the hospitalization cases.
Is it cheaper? I think so, but I can't find the numbers. And IIRC it's easier to transport and keep at remote sites.
Is it a good option for poor countries? Probably yes.
[Hi from Argentina! We used a mix of all the vaccines that were available, because nobody had enough stock. I got AstraZeneca x2 and Moderna x3. I almost got Pfizer, but I went one day after the stock got depleted. My wife got a few Sputnik or Sinopharm and later a few Moderna or Pfizer, I already forgot the details. Now that everyone is has natural and artificial immunity, the difference is probably not a big deal outside the risk groups.]
