What's all this about Force India have only just got the same engine as the Merc works team, who have had it since Barcelona? #CustomerProblems #UnfairF1
To give Mercedes half a defence, that can also be down to how the individual engines have been used. The updates will naturally be made available at the perfect time for the works team, if Force India, Williams, etc have had to use engines in a different pattern due to failures, then they won't get the updates until they take a fresh engine. Or it might be blatant favouritism, but there we go.