Yeah, all the i-cable crap they tell you over the phone has fine print. So if you wanna play safe you have to read the text to end up with the conclusion that you have no rights whatsoever to complain about anything, or any part, regardless what the sales guy told you. So basically with i-cable you're reduced to "you better damn sure that shit works from day one, because otherwise you're SOL and paying for it for the remaining of the contract period".
Three Broadband has some crappy fineprint stuff like that, and similar circular conversations with the sales dudes if you try to clarify them.
PCCW might have them too, but I believe at least their service is fully reliable. If you're IT, I wouldn't consider i-cable. I got burned already once when I needed urgently to remote to a server, and ended up doing it with the phone's 3G due to the i-cable's modem refusing to connect. I wasn't very happy that day.
EDIT: I see you figured out by yourself already all the i-cable inner stuff (like, not FTTH but more like FTTB)...If your building isn't very new, the internal antenna wiring might leave to be desired. When many people connect to the internet (or turn on their TVs!) signal noise compounds, and your synced speed decreases noticeably. One important thing of i-cable is the quoted speed is usually NOT reachable after 8PM on any given work day, as people get back from work and turn on their tellies/use their internet within your building.