I would have to agree with
yosithezet
It really depends also on how many Matmid points you have to blow, but using them for a Business class trip is always the best value on a long flight (its questionable on the shorter European flights)
Service in Economy is good but it’s not Business/Platinum and the differences would be just as they are on any other airline.
Personally I would go for it (Business that is

)