I do not yet have a blackberry. I have been looking at the 7130c for the past few weeks and the ONLY hold up is that I cannot use it as a modem (bluetooth or tethered) on my MacBook Pro. I would pay a decent amount of money to get this functionality.

If the modem feature doesn't happen within the next two to three months I will be stuck getting the larger Cingular 8125 because it does work with Macs the way I need it to.

As for your ROI... I'd be willing to pony up 150$ for a stable solution...