I use it and have a toodledo "pro" account, but I have been using "Task PRO" lately and prefer it.
I just think it has a more accessible interface. It can sync/import from the Toodledo server, which is convenient. It also has an embedded web server/web application that affords desktop access to its internal database. This isn't as convenient as the Toodledo web interface, but the Toodledo web interface itself is pretty clunky.
I especially like Task PRO's interface for creating subtasks. Just seems more natural than Toodledo.
I think these 2 are probably the best available in the app store. YMMV.