It is completely rational to have concerns about the speed with which these vaccines have been developed....but it's worth noting, that due to the biggest (almost existential) threat to both global health and the global economy - there was an unprecedented world wide effort to develop a solution. Nothing else was more important, so it happened because it had to happen. It is my view, that even though the safety checks will be fast tracked, they will be thorough - because they have to be thorough, or the vaccine could cause more damage than the disease.
The big benefits of the Oxford vaccine (as I understand them) are:
1. This "Jamie Oliver school dinner" type vaccine, can be transported and stored at fridge temperatures - which is something even developing countries can manage - whereas few countries can handle the fancy "Heston Blumenthal" vaccines, due to the exceptionally low temperatures they need to be stored at.
2. It has a 90% efficacy, where the first injection is a half dose.
3. The fact that a half dose is used on the first jab, saves precious vaccine and gives a smaller potential reaction.
4. This is a "traditional" vaccine, so uses very familiar, proven technology
5. It's more affordable, as it is being distributed at cost
6. Matt Hancock has actually bought considerably more of this, than he was originally advised to do - potentially the best decision he has made as Health Secretary.