I've been burned by products before where you'd get a lifetime subscription only to later find the company no longer responds to requests for help or the product just stops working because upkeep has stopped but so far TidyCal has worked great for me since I purchased the lifetime subscription. I hope the company does well and continued to roll out updates and maintain it because it's been a fantastic alternative to all the other online calendar scheduling tools. I can book all kinds of interviews, contact requests, consulting, charge, sell products from my own site, and done with subscription fees. Just hope it hangs on for a few years.