I found the Gran Bois Cypress to be a relatively fragile tire. The thin, supple casing certainly is comfortable, but it doesn't deal with punctures very well. After a 300k, I switched back to Panaracer Paselas and found these to be a little less forgiving, but a lot less flat-prone.
Though, now that my tires are wearing thin, I'm idly considering giving the Cypress another try, especially now that there's a 28mm version (my previous 30s also tended to be a tight squeeze underneath the fenders.