Lived in Halifax for 10 years and recently moved back down South.
It's a centrally located place to be near to most locations, unless you have to travel to the UK extremities - lovely landscapes and architecture (Piece Hall, Wainhouse Tower and Dean Clough are great) and most of the locals are friendly.
House prices are IMO expensive for the area due to it being commuter-ville for Manchester and Leeds and there is a rough side to it, as with most places though.