I haven't purchased one, but according the the fashion communities I am part of, they agree it is absolutely the best "value" for what you pay.
http://www.wsj.com/articles/SB10001424052748703385404576258671135584478
Quote from the above article:
"Testers said a $614 suit from Suitsupply, an Amsterdam-based company that will open its first U.S. store in New York next month, matched a $3,600 Armani in quality and outperformed designs from J. Crew, Hart Schaffner Marx, Target and H&M"
All of their cuts are very modern and slim.
They have in house tailoring if you purchase in store. Its free with the purchase, and you won't have to waste more time by going out and spending money and risk an old fashioned tailor not giving you what you want (For example, when I ask for no break on my pants, they say, no no, that's too short, when in fact it looks best IMO)