I’ve got an Altitude, precursor to the Latitutde but without the 44mm headtube and the seatstay finger bridge. Run it with 120mm forks, and it’s built up pretty light yet quite tough. It’s an excellent bike, it’s definitely not too steep for hairier descents (mine has been chucked down quite a few for sure), and it makes me smile every time I ride it. In fact, I’ll go so far as to say that IMO it’s the best hardtail I’ve ever ridden, and that’s a lot of them in 17 years or so of riding.
The 456’s aren’t bad, but having owned a 29er Inbred myself previously, I can vouch for the poor quality paint and the weight of the things. 456’s are closer to 6lb than 5 iirc, and the Genesis is more like 4 1/2lb, so it will be 1lb or so heavier if that matters. Oh, and though they’re obviously popular for a reason, I don’t think I’ve ever spoken to anyone who really loves their 456, seems to me they’re good cos they’re cheap and better than anything else for sub £150 (same as my 29er Inbred was really IMO) rather than cos they’re good full stop.
That all said, that Saracen Kili Flyer at £350 above looks incredible for the money. Or at £300 there is the Cotic BFe which shares the same geometry as the amazing Soul (Genesis Latitude is pretty much the same too), but is cheaper and a bit heavier.