Did your S2 come with all english manuals? was documents in there in chinese?
if you read expansys.com.hk website T&C they only offer 3 months warranty and you have to buy an extended warranty. I think they are selling grey market imports as well, as they don't seem to honor the manufacturer's warranty and in their forums when someone asks about it they just keep saying 3 months warranty. I also read in another forum somewhere from people who from expansys hk and when their phone had a fault it got sent back to UK. i think it's because its a grey import as it's meant for the european market so it had to be sent back there to get repaired.
There is a reason why their phones are so much cheaper, the S3 is $700 cheaper than fortress, broadway etc. at $4900 which is the same price someone at work paid for one from a small shop in the plaza in mong kok. i think expansys hk sells grey market good as well thats why they say the warranty is with them, not the manufacturer and only for 3 months.