I'm on Sprint with the unlimited data package (from work). Cost to the company is about $100 per month. Data speeds are great. I did a speed test with the 8830 connected to my laptop in the phone as modem mode and I can download at around 600k and upload at around 300k...maybe a little less. So it's very nice as an internet connection if there's no wifi around or a wired connection for my laptop.

The device itself seems well built, very attractive appearance and very easy to use. track ball is wonderful.