OK so lets sort this network out once and for all... after reviewing a few things and hitting up UBNT's website I ordered the DM Pro to replace my Cloud Key Gen2 Plus and USG Pro 4 - did it purely on the massively improved throughput, gaining 1U back in the rack, and isn't it better to reconfigure on new kit than just reset and repeat on "old" stuff - hahaha. Top bonus too - I was able to order an early release of the European LTE modem (serious whoop whoop!!). Ordered late Wednesday, shipped from Czech yesterday evening, delivered to me in Scotland an hour ago! Incredible! Go UPS!