If you have looked through the technical forum you should see the issues that people have.
I've no experience of the 1.6 Diesel or the Cross Plus but love my 1.4 Multiair Cross. The Plus has more toys and the Diesel is more economical than the Petrol but as with all vehicles, getting the manufacturers MPG is unlikely.
These cars seem to do their depreciation early on so there were plenty of Crossplus Diesels earlier in the year for around £12k , around £8k off the new list.