I hope he's had better luck integrating spell check than the RamBox devs have ;)
edit: yes, I would love to test it and provide numbers rather than just snark - I just have to wait for the ~5,000 people ahead of me in the queue to have their software pressed to disk and posted to them before it's my turn o.0
As a hacker news link it does strike me as a form of clickbait (and it honestly winds me up); "Hey HN! come look at this thing I've built that I'm not letting you look at!"
Also, if it's bugs and the reporting of that you're worried about, maybe publish a proper bugtracker (github is both adequate and free) rather than just an email address?
* slashdot effect; as in taking a webserver down just with the amount of people viewing it. Or to put it another way, if you wanted lots of people viewing your project, let them. If you don't, then don't advertise it to them!
Best of luck with your client!