RE: HBSC Premier
If for some reason you can't get to a computer, you can do your banking on the phone with a dedicated Premier phone number. My branch in San Francisco also included a free safe deposit box. It's been my experience in the short time I've been an HSBC customer that their everyday services/products are mediocre, but they do offer some very useful advantages if you are trying to tether your finances between HK and another country. These advantages have been mentioned already, so I won't repeat them.
FYI, they Premier level requires a minimum deposit in one single location rather than the aggregate sum of all the HSBC accounts you hold around the world. And it appears it's considerably more expensive to reach Premier in HK as the minimum is $1,000,000HK. In the U.S. it's $100K US. Also right now, there is a promo in the U.S. that gives a free Dell Mini 10 for those that open a Premier account.