I've been ordering clothes from Frank & Oak for the better part of a year now and am also a Hunt Club member. The value of the clothes here are amazing: great fabrics, great styles, great construction, ridiculous prices! Customer service has always been highly professional, friendly, modern and swift.
For example, my first purchase was a wool sport coat. It stayed in my closet for a couple months because I wanted to get it tailored, so I never had a chance to wear it. Gradually I realized the reason it needed so much tailoring was because I had slimmed down and the sport coat was just too big for me! I reached out to member services and they sent me a replacement as soon as they had a return in my size--months after the product had disappeared from their catalogue.
I have interacted with their customer service via email, Twitter and Facebook and always receive a prompt response. Their Hunt Club allows me to try on their clothes without a commitment to purchase and a full refund for everything I send back--and the postage is paid by them! I cannot recommend Frank & Oak enough.