I have really good experiences migrating 10g to 11g over database link. As you say long and long raw do not work but everything else seems fine ( lobs etc). Make sure you are patched up as high as you can go as there are lots of datapump bugs generally - not just with db links.
It's much more efficient that having to go out to a file.
Parallelism will do 5 separate tables at the same time - it does the biggest 5 first. Indexes will then be built with parallel 5 after the tables.
Just make sure streams pool and PGA are plenty big enough both sides.