But then I saw this 7T on eBay. It is unused and cost less than a Nord, so it seemed an obvious buy. And indeed it is in immaculate condition.
The only problem I've found is that my OP3 used to turn on automatically when I opened the case, and the 7T doesn't do this. I don't know if the case I got for the 7T doesn't have the right magnet to turn it on, or if the 7T doesn't have this feature.
To be fair it's only a mild irritation.