NW04 Change from Sync Servlet (java) to Sync Service (ABAP)

Hi,

we are about to apply NW04 support stack 20 (from SP14), currently used for Mobile Sales (M.I. 2.5).

We have the option to move from the "old technology" java sync servlet to the "new technology" ABAP syncronisation service.

So we were wondering;

Has anyone done this before?

What are the benefits / issues?

Was it worth doing?

Any advice / tips welcome

Nic