Surprised that there's no thread for this one already? Perhaps it isn't gritty enough (it does seem to have been somewhat toned down with a stateside major release in mind) what with it being a French/Italian co-production with top tier technicians (though not necessarily better than the ones working in lower budget films at the time) like DP Aldo Tonti and Leone-regulars Nino Baragli (editor) and Ennio Morricone (whose over-emphatic score is not one of his better works) but it has some great stunts (the opening car chase, for instance) and - despite Jill Ireland - some good performances.
Or perhaps it has not been talked of much here since it's been widely available on DVD since 2001, has been reissued, apparently the UK disc is also a port of the Anchor Bay version, and the cut German DVD has an English track as well.
I've got the OOP Anchor Bay disc of this (the Blue Underground DVD is a straight port of the Anchor Bay). It has been mentioned on the Mobius board that although the Anchor Bay/BU releases do restore footage not present in the English version in Italian with English subtitles, some of the restored scenes were indeed in the US version with English dubbing (as with the restored Anchor Bay releases of CUT AND RUN and FOUR OF THE APOCALYPSE). Before the Anchor Bay disc, I was familiar with the film as THE FAMILY. I had seen it on TV and got a copy of MPI's Gorgon Video-looking clamshell release which turned out to be a TV print which was further cut down from the US theatrical version (which I do not believe has turned up on tape stateside). The English titles are arranged and sized differently between the US and export versions although the content and opticals are the same (I've also got the impression that the end titles were redone for the disc release but I haven't compared it with the tape).