We've upgraded to Jade 6.3 and found the new feature being able to check out a method in multiple deltas appealing. However we found a major problem when the person who checked in their changes to a method first found them not there after the second person checked in their modifications. Each delta held only the changes the current user had made to the method.
There doesn't appear to be any checking or warning that the method source has been modified by another user when the second user goes to check in their changes. The checked in changes aren't visible in the second delta - presumably one of the indicators there will be a problem with the check in.
In a multi-developer environment this makes this feature practically useless as the risk of losing previously checked in modifications means that we will be implementing the ini file setting to limit to single delta checkout immediately. It would be great if Jade were able to implement conflict detection as a minimum and preferably the checked out changes picking up any changes made to the method outside of delta.