AeroPod, PowerPod and Newton

I've currently got the iSport GT coupled with a Garmin 705 to help with fitness training and for pacing myself on Audax rides.
I've just got another bike so I'm ordering another wireless mount.
Seeing as I have to pay for international shipping I was wondering if its worth adding, say, a USB adapter to the order? Will that let me get firmware upgrades or would I need to upgrade to the iPro for that?

If you purchase the USB Adapter you will be able to do iSport upgrades with the free iBike software. Your iSport will not be able to download rides.

If, later on, you decide to upgrade to an iPro please email us so we can provide you an additional discount on the iSport-iPro upgrade.

Thanks John.
I've ordered the wireless mount and usb adapter