Having read Rob Tiffany's previous book on synchonisation I was delighted to get my hands on this updated version brought up to date with the latest SQL Server 2008 and SQL Server Compact 3.5. The book covers the necessary theory and practise for planning and implementing your synhronisation architecture. When it comes to actually configuring your system the book uses a clear step by step approach with screenshots to illustrate each stage in the process. The author shares his experience through simple tricks to check for failed synchronisation through to lengthy discussions on performance tuning. Overall a very valuable read!
Replication can be tricky, especially to mobile devices using HTTP. This book came in handy, but I needed to use it in conjunction with MSDN examples to get what I was doing working correctly. It's fairly expensive for a small book hence 4*.