As others have posted I have found value in the travel together cert in the recent past but with all the devaluations that have hit BA both on the spend and earn side it really only *may* make sense for F. Even then you'd have to think hard about it. For lesser classes it is a total waste.
The irony is during the recent BA J class sale you could buy a J ticket for less than the YQ fees on an awards ticket. Wife and I both currently have travel together certs that I suspect will expire before I get to use them.
Also like others here I'll be reevaluating whether to keep this card. Basically its only two redeeming values (outside any sign-on bonus) are the 10% off on BA flights and the travel together cert.