I've used Excelsior for more than 15 years, both in their BKK shop and on their twice-yearly visits to Coppenhagen. While mostly pleased with them over the years.
The value of custom-tailored clothing in Asia is
2. Convenience - They come to your office, hotel, home, etc.and keep your measurement in their files.
3. Price vs. Tailored in the West
I find that Excelsior suits and shirts are made of superior quality. The fit is finer to off the rack of Armani or Boss(not surprising, as Sonny insisted on two very careful fittings; AS needed only 1), the features are better (such as the pleat in the back), and the button stitching is more secure.
I'm getting some cotton-silk shirts next run, and possibly some pants. My son gets a suit. (My wife gets the bill?). . Also, if you have pictures of outfits that you like, take them. It helps with the final creation.