In reply to malc:
I have Mantas and I don't have Only A Hill's "big feet" issue re: "bendiness". Done a few easy (I/II, maybe a bit of III) plods in them with no issue. Felt some real calf strain on Tower Scoop (seconding) and concluded that this is where B3 boots start to help. Of course it's possible to lead much harder than that in Mantas but it's also possible to do so with more ENJOYMENT in winter boots.
I now have Scarpa Grandes Jorasses and C3 crampons (some old stock Mountain Technology model) but have only used them one, seconding a III in thin conditions. Felt the improvement.
FWIW if I was about to spend £240+ on new boots, I would go for something like the Jorasses or near equivalent (Mammut do a nice one). They are actually lighter than Mantas (or at least I perceive them to be).
I am not sure where Mantas really lie in the marketplace these days. They hark back to an era wherein "winter boots" were Scarpa Vegas, but B3 boots have come on in leaps and bounds since then.
There was a thread on here a while back asking "what bit of kit do you most regret" and about 5 people said "Mantas"; at first I was "hurt" as they were my main boots, then I remembered that I had only paid £50 for them and that I'd be unhappy had I paid £240+
I got my Grandes Jorasses in a bargain Go Outdoors sale (on impulse!) for £187. If you are not in a rush, keep your eye out for a bargain.
And obviously for other hiking needs just get some light trekking boots maybe? But I am not sure what your other hiking needs ARE, of course