I've purchased Antnotes today for 2,99 on the App Store, so consider this a very fast review (but it is a stickies app). I've found it useful, well working, more features/customizations than expected, and nice too. I had no problem on both 10.7 and 10.11. I've been using OS X native Stickies, because the alternative I paid for never worked properly. Antnotes seems to fit my needs (especially with notes attached to apps, notes pinned on foreground if desired, archived notes purged automatically), it supports my older OS, a few bucks... ahead 5 Stars!