Did some extensive test today on 2010. What a mess. All pipe runs from 2006 are distroyed by 2010. Rounding factor in program needs fixed. Also pipe runs already in place are changed to flat pipe runs when opening an existing file. Transition form 2009 is no exception. Connection points in 2009 are clean bring th same drawing into 2010 and pipe connections are no longer valid. Also I see a problem in the routing types. These are lost between products. Way to go Autodesk!! You did it again. I see there is twice as many steps to accomplish the same thing done in 2006. When is the re-write going to be intuitive enough to know what the connection is when you grab a fitting for continuation rather than go back to the pipe menu to select a pipe. To me a flange is a flange is a flange. So I ask why should we even migrate to a product costing more time and maintenance. Way to go Autodesk!!!
P.S. pipes in a drawing shold not be touched or moved when brought into a newer version of the same product. You THINK!!!