I live on a boat in the DB Marina, ask me anything you like.
We chose it over an apartment in Wanchai as it was more bang for our buck - certainly more space!
I will tell you it's 100% safe in terms of crime. No one even locks their doors (plus there's reception and security).
As far as the typhoons go, our boat was 100% fine during the T10, though have heard a boat down the other end didn't fare so well.
There's a pool, tennis courts, a gym, a bar and restaurant...it's a resort kinda lifestyle, but having said you have to ask yourself if that's what you're moving to HK for?
Also since moving here in May 2012, my direct neighbors are great but I haven't found it as friendly as I thought (the women are a bit "clicky" here and as far as I can tell I'm the only woman in her 30's without kids so they have no interest in me at all).
P.S. I see you're Canadian, there are plenty of others here so you won't get homesick!