I used to work at a place that tested their apps on a ~7 year old computer with a <1Mbps dsl line. It was awesome. They knew how to makes stuff load fast and efficiently.

I hate that I have to tell devs this, but: Yes, your data-hungry app may work well in downtown SF, but try using it in a place like nowheresville, TN, and let me know how well it works out. /me glares at google maps