Few industries, if any, have a range in the level of customer service as that found in online casinos. Service runs from nonexistent to phenomenal and everywhere in between. The 5-potato rated casinos listed on the Home page have one common denominator: superior customer service. These are the casinos that will rapidly respond to your queries and conduct themselves in an absolutely professional manner. At the opposite end of the spectrum, in contrast, are those casinos which do not have a working email address or phone number, take days (or weeks) to reply to your emails, and generally provide the same level of courtesy that a life-row inmate might expect from his warden. Dealing with poor customer service is always annoying; when dealing with a business that is entrusted to hundreds or thousands of your dollars, however, you should (rightly) expect that your questions will be answered promptly and any issues resolved courteously.
There are a few simple checks you can do to gauge the responsiveness of a casino. Can their contact information be easily found on their website? Do they list phone numbers and email addresses? Do these numbers/addresses work? If the answer is no to any of these questions, just move on to the next casino. You will spare yourself a future migraine.