I have had excellent service and no problems with both Mountain Rose and Pacific Botanicals. I get my BSM and ACV at the health food store here and coffee from Wilson's of course and what I don't make myself from Uny. I have an order coming from StarWest Botanicals right now because I needed the apple pectin to make IF#2.
The big disadvantage is shipping costs of course which are really high. If you can get it shipped USPS (if you are not in a hurry!)that is best. Most companies, though, as soon as it is international (even if it is close in distance) automatically do UPS which is very expensive and their service (at least where I am) is sketchy. I save up and do as much from one place as I can to save costs. Sometimes there may be a lot better deal from one supplier but unless you are buying a lot from them, it is completely canceled out by the shipping.
I have searched some for domestic suppliers of bulk herbs but found the prices outrageous and was not satisfied with the guarantee of quality (organic, etc.). Maybe they are out there but I haven't found one yet. I would definitely love to simplify things.
My observations... Take care.