Yes I agree completely, though as I initially bought this for just checking faults, I was okay with that but I'm unsure if they will ever automatically roll out newer limited updates via the app store - like any other tool like this would - or is it up to you to be on their Facebook and/or Twitter feeds and only get limited updates that way. I think that you could either call their business model very cynical or devious - not good!
Did you get the impression that if the original pro version was bought before the new price structuring, that any newer limited updates would be automatically rolled out via the app store in the usual form of "there is a newer software available", or only if you were on their Facebook and/or Twitter feeds - or not at all?