Quality is average, I'd say on par with Zegna or Lorenzini and the likes. Shell buttons, single needle tailoring, good selection of decent fabrics.
Definitely not close to Borrelli, Barba, Finamore, Charvet, Kiton, Truzzi, etc. as far as quality, construction, details, and fabrics.
If you like British shirts I would recommend Hilditch & Key over T&A as they pattern-match better, and the buttons are a little finer grade. They'll have similar bold striped and checked fabrics, ala T&A, though perhaps not to the same degree. Also the prices are lower.