Rehingd-
First, Google explicitly states that their CalDAV support is a
"developer release" which they "strongly suggest you restrict to test
accounts only". Beyond that, here's a quick run-down of some of the
problems our users have found with Google's CalDAV solution, and how
Spanning Sync compares:
1. iPhone incompatibility
Calendars synchronized using CalDAV become read-only on iPhone. One of
our biggest customers is in the process of rolling out 700 iPhones and
200 iPod touches. This lack of iPhone compatibility makes Google's
CalDAV solution a non-starter for them, and for anyone else looking
for bidirectional sync between iPhone and Google Calendar.
Calendars synchronized with Spanning Sync are editable on Google
Calendar, iCal, and the iPhone calendar, and changes made in any of
those places will show up on all three (after syncing your iPhone
using iTunes).
2. Lack of customer support
Sync is inherently complex, but most problems can be solved quickly
with just a little customer support. Unfortunately, Google doesn't
provide any. They've even said publicly that it's "not feasible" for
them to respond to individual requests for support.
At Spanning Sync, we provide support our customers have called
"tremendous", "excellent", and "stellar", regardless of whose software
is causing the problem: Google's, Apple's, or ours.
3. More Complex configuration
Configuring iCal to use Google Calendar as a CalDAV server is not for
the faint of heart, and to make matters worse, the process is
different for primary vs secondary calendars.
Setting up Spanning Sync is essentially self-explanatory.
4. Lack of international support
Google CalDAV doesn't support international character sets, so
calendars in Japanese, Hebrew, Russian, and other languages are turned
into gibberish.
Spanning Sync has full UTF-8 support for non-English languages, and
has been used by people in 58 countries around the world.
There are a number of other issues too (e.g., see
http://groups.google.com/group/google-calendar-help-bugs/browse_thread/thread/bd6157f3cf414a81/)
, but these are the ones that have jumped out at us from our users'
early feedback.
Regards,
Charlie