I use my SP3 as a desktop replacement, but am finding it a bit slow on applications like photo editing. So I want to upgrade to the New Surface Pro. But I love the SP3 docking station and hate the port replicator device that MS are now offering instead. Some users report that the new SP does work in the SP3 docking station if used with the SP4 adapter, but MS in the UK do not officially support this and will only supply the adapter to registered owners of an SP4. Is there any way round this?