I agree with the other positive comments, this 'Long-Room-Hub' building raises the bar big time. It combines simplicity with sophistication, and brings an artistic attention to composition and proportions that we haven't seen in these parts in a long time.
The placing of the building in a tricky context [or I suppose more correctly, the design of the building to fit the tricky context] looks completely successful to me now that it's done, so I'll have to hurriedly draw a veil over earlier misgivings.
I should probably stop talking now.
. . . but this being archiseek, it'd be a shame not to chuck in a few reservations.
I'd remain a bit concerned that the crispness in the stone cladding may have been delivered at the expense of all the clumsy weathering details that traditionally we've always incorporated to prevent external stonework from quickly becomming damaged and stained by frost and rain. Unless I'm missing something, all external weathering relies on a 5mm mastic gun.
Lets hope that performs better here than it's been doing around gunter's bath tub.
Another reservation I'd have is with the design of the entrance. This area seems to have changed since the model was presented and neither version looks entirely resolved. Two elements that are completely concealed in the rest on the building, the concrete core and the structural steel frame, make a surprising appearance in the periphery of the grand entrance, and both look like an after-thought.
Over the entrance steps, a pair of white painted steel beams hold up a heavy, and apparently functionless, block of stone cladding while lower down some black painted steel frames lurk beside the lift shaft.
The smooth finished concrete of the lift shaft [which makes the grand stepped entrance possible in these days of universal access] flanks the main entrance and is oddly not clad in stone - given the prominence of it's location.
If the concrete finish is a reference to the great Berkley Library opposite, I'm not sure if the reference really works. The board-marked concrete of the Berkley is clearly intrinsic to that building, both in terms of structure and expression. At the Berkley there's a clever parity of esteme between the poured concrete elements and the refined granite cladding that weds the consciously modern building to it's venerable old campus setting.
You're tempted to ask, if the poured concrete at the Long-Room-Hub was an acceptable finish for the entrance way, why was it not an acceptable finish elsewhere?
Anyway, these are just minor reservations, overall I think this is a wonderful addition to Trinity and the city.