Sync for ADO.NET CTP2 - Batch Anchor proc is broken?

In the documentation for the CTP2 it gives a sample stored procedure called usp_GetNewBatchAnchor, but from my tests it doesn't seem to work.
I had to make a few changes in my version:

• parameters are defined as "timestamp" data type, changed them to "binary(8)"
• for consistency I changed the "out" suffix on 2 of the 3 output params to be "output" like the 3rd one
• multiple checks of "IF @sync_batch_count <= 0" need to be replaced with "IF @sync_batch_count IS NULL OR @sync_batch_count <= 0"

NOTE: you'll also need to change the tables it's using to check for the min timestamp value, in my case the following:

SELECT @sync_last_received_anchor = MIN(TimestampCol)
FROM
    (
        SELECT MIN(CreateVersion) AS TimestampCol FROM dbo.BillingInfo
        UNION
        SELECT MIN(UpdateVersion) AS TimestampCol FROM dbo.BillingInfo
        UNION
        SELECT MIN(CreateVersion) AS TimestampCol FROM dbo.Employees
        UNION
        SELECT MIN(UpdateVersion) AS TimestampCol FROM dbo.Employees
        UNION
        SELECT MIN(CreateVersion) AS TimestampCol FROM dbo.Projects
        UNION
        SELECT MIN(UpdateVersion) AS TimestampCol FROM dbo.Projects
        UNION
        SELECT MIN(CreateVersion) AS TimestampCol FROM dbo.TimeEntries
        UNION
        SELECT MIN(UpdateVersion) AS TimestampCol FROM dbo.TimeEntries
        UNION
        SELECT MIN(DeleteVersion) AS TimestampCol FROM dbo.TimeEntries_Tombstone
    ) MinTimestamp

Before I made the above changes I was getting erratic behaviour depending on the batch size specified. Now everything seems to be working as expected.