Install update:
Saris has now put up a patched version that works much better. The version is 7.0.1. It seems to have solved the port problem. If you're using 7.0, trash it and install the patched version.
Also, be aware that the PowerAgent installer doesn't install the USB driver. This must also be downloaded and installed separately (with at restart required). The driver has also been patched, so if you have an older FTDI driver (i.e., if you were already using freeware app Golden Cheetah), you must trash it and RESTART before installing the new one. The location of the driver is: MacHD/System/Library/Extensions/FTDIUSBSerialDriver.kext
If you do this you should have no problems with PowerAgent 7. The new driver also functins well wil Golden Cheetah if you want to continue using that.
Mini Review: Yesterday I downloaded a five-lap Central Park race and was able to delete all the unwanted "activities" such as ride to and from the park, race sign-in, warmup, peeing in the bushes, etc. and just isolate the race, so the "slices" were quite useful for this purpose. I then was able to select the data for each lap as a separate interval. They were pretty easy to identify on graph, as finish line was uphill and each lap had a distinctive repeating pattern. Nice for cold race days when it's hard to hit the interval buttons in your neoprane gloves.
Other Features: Aside from being able too select and permanently save intervals within a ride (nice!), you can view at a glance a bar chart of your power distribution by work zone, a bar chart of your heart rate distribution by work zone, a line graph of your cumulative vs. current Peak Power curve by interval(Mean Maximal Power in WKO+). And of course you can view a summary of all your maximums and averages, as well as your peak power by set intervals.
Missing features: If you've already tried CyclingPeaks you will immediately notice that it lacks a few things you might now consider essential, such as:
1. normalized power
2. data smoothing
3. ability to de-select parameters from display (i.e.:
power, hear, cadence, speed, etc.)
4. user-defined value axis for graph
For Windows users who are already used to all the cool features in CyclingPeaks, PowerAgent 7 might seem a tad bare bones, but for Mac Users who had no way to use their PowerTap natively it's quite a nice little Xmas gift! It's still a bit funky in it's behavior, but it's now stable and usable. It's also attractively designed and nice and easy on the eyes. It has the streamlined look of a Mac application. You can read it fast and quickly see where your fitness is going.
Conclusion: If you've already invested your time/money in getting Virtual PC and CyclingPeaks working on your Mac (or even buying a separate Windows machine!) you'll probably just stick with that. But if you're a dedicated MacUser just now buying a PowerTap, it's definitely a viable way to immediately get started with your power training without having to wade through Windoze.
And for those who will undoubtedly feel the need to deepen their mean and maximal obsession with the ever narrowing minutia of their ride data and what it might mean, PowerPeaks will still export ride data into .csv files so they can at some later date migrate to WKO+ and join the ranks of those who are truly "gone" (personally I'm teetering on the edge).
Hope this info is useful to someone.