Coming from Virgin Mobile and being aware of the caveats with Straight Talk, I was initially uneasy about switching. But, I've only used 150 MB of cellular data according to the iPhone usage screen since I started using an iPhone on Mar 22. I came from a feature phone before that, so usage was negligible I suspect, my month had started days prior to getting the iPhone.
With moderate to heavy wifi usage, i feel it's entirely in the realm of possibility to stay under 500 MB even per month. I only watch YouTube over wifi, and the Slacker radio app allows station caching over wifi, so no 3G usage when that's running either most of the time.
I understand that everyone's usage is different, but with these prepaid plans, you will hit a wall somewhere, whether it's slow / throttled data, hidden caps, poor coverage, no byod, etc. ST was enticing enough for me to ditch my $25 Virgin plan even, and is IMO a great value in wireless, despite these unspoken caps.
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