Maybe Reminders is worth looking at but if you look at reminders you may also want to give Wunderlist a shot. If you think OF is slow at syncing then don't try Evernote as it is the slowest at syncing.
Regarding web based apps I have always found I tinkered too much with Toodledo. If you liked Things except for the recent problem then try Nirvana, which is basically a web-based Things clone. I believe MarkDillon uses that.