i love CT.
I think that generally because of the wear and tear that shirts see day in day out, its rarely worth paying for ultra expensive shirts from the likes of Turnbull & Asser and Ede & Ravenscroft. In terms of well designed and well made every day shirts the CT's are of excellent quality and superb in price. They also have a decent range of fitments.
Where they excel over the likes of lewin, is in their accessories. Their shoes are Loake (the better ones are from loakes 1880 range), their gloves are hand made italian jobs and their jackets etc are excellent. I've had a tweed jacket from CT for 2 years now and it still looks good as new.
In general I go to them for most stuff now. Its hard to justify spending more, when they give you so much for the money. The only other brand i swear by is Polo by RL... but only at outlet prices or sales, as full price they are off the mark. But for jumpers, oxford shirts and trousers i prefer RL. Shirts, jackets and accessories, i head to CT