Perhaps it would be clearer if some RTM veterans qualified their PRO membership to others rather than participating in semantics.
The RTM web application is completely free to use and works very nicely I must add, a Pro membership prvoides you the ability to use their mobile based applications to sync with their web app and also gives you the warm fuzzies from supporting them as their staff are quite the friendly bunch (they are Aussies so of course they are)!
So basically Pro membership entitles you to use their excellent iPhone native app, which I must say is a joy to use! The defaults are so well thought out and it is obvious the app just hasn't been hacked together but rather someone has taken a lot of care in getting the user experience just right instead of pushing an app out that isn't ready expecting the general public to test and refine it for them like a lot of other apps out there.
Yes OmniFocus and Things are cheaper once off costs but just for their iPhone counterpart, they have no web app so if you want to use them on the desktop then you need to buy their rather expensive desktop counterparts! That was one of the main things that turned me off OmniFocus plus it was slow and overly complex.
With Remember The Milk you also get email and text message (they send their own texts and don't rely on a third party service like Twitter) alerts for tasks so assumedly once apple finally gets its act together with Push then RTM would be able to support it where both OmniFocus and Things would not be able to as they don't have their own server architecture.
In the scheme of things $25 a year really is not that much, that is less than a week at Starbucks for a lot of people!
