It is a one-direction sync at the moment. We figured that if people are using Toodledo, they probably aren't using Reminders except as a conduit for Siri or for migrating from Reminders to Toodledo. Can you please explain why you would want to use both Toodledo and Reminders at the same time?
Having a two way sync Reminders<->Toodledo app would simplify the way I get tasks from my Exchange Server to my iPhone and vice versa.
My setup today
Exchange server <- native sync -> Outlook Client
Outlook Client <- gSyncit -> Toodledo.com
Toodledo.com <- native sync -> Toodledo iPhone app
Setup with two way sync Reminders - Toodledo
Exchange server <- native sync -> iPhone Reminders
iPhone Reminders <- two way sync -> iPhone Toodledo app
So if you could add two way sync between Reminders and Toodledo on iPhone to your backlog I would be very happy.