I've been using Google Calendar for years now to remind me of appointments. I set it to send me an email before an appointment, and I rely on that email to remember the appointment. I like the fact that I can put something in my calendar and then completely forget about it, trusting that the calendar will remind me of it in the time that I've set.
But for the last few months I've noticed that Google Calendar sometimes simply forgets appointments. It happened many times, both for recurring events and non-recurring events, and with different alert options. (Email, SMS and pop-up.) Over the last two days it forgot about 5 reminders, and now I'm really pissed and I want to find another calendar service. Google Calendar's UI is excellent, but the fact that it forgets reminders is simply unforgivable. I have also contacted them about it and was ignored.
Can anyone recommend a good quality calendar service that I can count on? I'd also consider paying for one.