Working Copy is celebrating 12 years on the App Store.
To mark the occasion the pro unlock is now permanently cheaper: 29.99 instead of 35.99 in US dollars and euros, with similar cuts in other currencies.
If your pro unlock is more than a year old, upgrading brings every pro feature added since. Until November 13th the upgrade is 9.99 instead of 17.99, and after that it settles at 14.99.