Unfortunately they do look very good at the minute. Their forward line's movement and inter changing of positions is top notch.
Their Achilles heel is still their defence, and that in part is due to the way they're choosing to play as opposed to just the personnel.
They won't go a full season scoring for fun, and there'll be weeks when it doesn't click up front and they'll have to grind out a 1-0, can that side do that? I'm not so sure.
Also, as the season wears on managers will suss them out, someone will find a way of negating their play and it'll be copied by others, it happens every year with some side or other who are flying early on.
I still think they'll be in the mix come May though.