Given the reference to 1987, I have the suspicion that the OP is talking specifically about the ref. 376.0822 Speedmaster Automatic, originally nicknamed "the grail" by Chuck Maddox, which in later years morphed into "Holy Grail". And assuming I've guessed right, yes, it is definitely marmite on this forum.
Given my personal history with this watch, I can only define it as a classic. While Speedmaster chronographs with an automatic movement had been around since the Mark III, this watch was the first one to take the Moonwatch's stylistic cues and associate them with the proven and ultra-legible Calibre 1045. That was a bold move in 1987 when watches tended to be much smaller and thinner. Presumably in great part because of that, this model badly flopped on the market, and it's no surprise that it was somewhat replaced by the "Reduced" which came only a year later. But for a few people, this watch left an indelible mark
Sadly for people like me, it means that out of the 2000 examples of this watch produced, the few that reach the marketplace these days do so at prices that are rather prohibitive. This means my hope of one day reacquiring one, a decade after adverse financial circumstances forced me to sell mine, is rather limited.
But I'll always remember that watch as a personal grail of mine, regardless of its nickname...