I quite like the two residential blocks, the overall form looks quite good, including the differing shades to separate them, and the close up view of those finishes look quite decent and well detailed (from the image). With regard to the affect of the views of the historic business area around St Paul's St, Park Place, etc, the saving grace are the towers are generally slim end on to this area so presenting a slender tall form which looks fine.
The big gain for me is this is starting to spread the taller/denser part of the city centre away from the busy cluster around the Merrion area, which will help with the overall 'city' look for Leeds.