you cant save opensource maps, but you can save your protune map as long as its done with the cobb software by a cobb tuner
True, the maps are not compatible, but if you download romraider and Access Port Race Tuner, you can open the maps up side by side in their respective programs and manually change the tables on the AP map to match you OS map.
IMHO I have had the accessport with racetuner software, it is a great tool. I currently am running Open Source though because I want to be able to use one device to tune multiple vehicles. OS setup is less than $200 plus a laptop to run it. OS does not have Launch Control of Flat Foot Shifting built in, but some tech savy guys have gotten it to work. OS does not support live tuning (yet).
The AP is what $500-$600? Plus the AP can only be used on one vehicle, and it locks the ecu so you can't switch back to an OS map without first unmarrying the AccessPort (This is actually a huge PITA when buying a used Subaru that has been tuned with an AP but didn't have the AP included). AccessPort does give you Launch Control and Flat Foot Shifting which are great, as well as the ability to live tune your map without reflashing.
From my perspective, the AP is a great beginners tool with flexibility to do all the professional level stuff as well. The OS setup (Tactrix) takes a little more knowledge before you would feel 100% confident about plugging into your car. Open Source I feel stays more up to date, but the information can be difficult to locate. AP info is very well organized. In the end you should ask yourself the following:
Am I comfortable with using computers, and adjusting my tune?
Do I have the willpower to search through forums to find the right answer?
Do I plan on having more than one Subaru?
Do I want to be able to tune friends Subarus?
If you answer yes to all those, pick up tactrix, if you answer no to any of them, get an AP.