Excellently executed on every level, I’d say.
Personal peeve (on every software product): The subscription model. Even though you make it clear that the product will still work after a year, I hate the idea. It’s why I jumped from LiveCode to Xojo, from QT to WX Widgets, from Adobe to Affinity.
It sounds like a very comprehensive, but necessarily narrow, product. For relatively little effort,(compared to what you put into it so far) you could throw in other system diagnostics like the usual CPU utilization, memory, hard drive space remaining, network connections, etc. I know Activity Monitor covers a lot of that, but the idea would be to expand its target demographic. It’s a great idea but it’s on the geeky end. The trouble is, the Mac handles these issues better by itself than Windows. If you could fix power and sleep management issues on the Windows side, I bet that would fill a bigger perceived need.
Speaking of perceived need, I would expand the scope to make it a power management solution rather than just a sleep app. I doesn’t sound like a Herculean effort (again, in comparison with what you’ve done so far), but it adds to the target demographic.
What you said about airportd sucking as much as 30% of the CPU during sleep was a real revelation to me. That might be worth highlighting. Maybe that means a lot to me because I’m a geek, but it was worth reading your initial message just to learn that.
The Mac market for system utilities is different than on Windows (where there is much more of a perceived need because it behaves so inconsistently.
I would echo most of what the other contributors have said, except on the language translation side–as you pointed out about KIA–just about everything we write can mean something else in a different language that may be inappropriate or contain negative connotations. When we meet the Martians, nuclear war could start just because the wrapper on their first Big Mac looks exactly like their one-finger salute.
Good luck with this. It looks like a great app and your site is beautiful, the endless scroll aside (which, as has already been pointed out, is the convention these days).