Originally posted by StreetShooter
Not sure about the sources of grey vs non grey, nor about any possible differences in quality. But mine works great!
What I do know is this:
Equipment bought at retail price comes with local warranty, which is usually for one year. During this time, if anything malfunctions, you get either free repair or free replacement (but not, of course if you drop it or disassemble it). After one year, you can still get it repaired, but have to pay for it.
Grey equipment does not come with any warranty, so if it malfunctions, even within a year, you have to pay for the repairs.
The difference in situation between Singapore and say, USA, is that Canon Singapore will repair any equipment, grey or non-grey. Canon USA, on the other hand, will not repair grey market equipment, even if you opt to pay for it. At least, this is my understanding.