I've setup SRM using vSphere replication many times and never had a problem, and typically data replication seems what I would consider normal for app/web servers of a couple hundred meg over a 12 hour time period. So I'm at at a new client and just stood up a new VMware 5.5 environment with SRM 5.5. During the last couple of days of testing we are seeing data replication for some servers in the 1-2 GB range over 24 hours, these are for a web and print server that have no real changes. I've never seen vSphere replication try to move so much data.
With all that said, if a block changes 10 times between replication cycles, does it replicate 10 changes of just the final change? I would assume the final change but the client is asking and I can't find any definitive information from VMware.