I've not got one for two reasons:
1. As it is only 802.11g it would slow down by 802.11n Apple network.
2. I've read some really negative reviews about the product, saying it works wonderfully until just over a year old and then boom - it dies (hey, a bit like the Xbox 360 then!
)
Anyone got experience of the Airport Express (good or bad) that they want to share?