Well the Mini 4 arrived today. Very impressed with the size and weight and the scree quality. It works really well with the Bridge keyboard I picked up as well. Only thing negative, it's a pity they didn't include the A9 chip. It's noticeable slower than my iPhone 6S, you can see the speed difference clearly.
Other than that, no complaints.
Though I did have a major issue earlier when iTunes decided to brick it temporarily. The device started fine, iCloud details etc were all inserted, no issues. Then when connecting to iTunes and attempting to update the software it continually came back with an error 17. Updating or restoring, nothing worked. It just had the dreaded iTunes symbol. I had to carefully follow Apples instructions to go into Terminal and slightly amend some Apple GS settings and reboot everything again and thankfully it worded and restored the factory settings. Phew!