Cheers, I hadn't specifically noticed that one. Elsewhere Mikrotik reps were hinting or implying forthcoming product releases with Gigabit Ethernet.
I've found a few issues with the Smarty/3 connection after using it as our full time home Internet for nearly two years now. Quite a few services seem to be uncomfortable with the changes in IP address, for example Paypal always makes a fuss, and once even refused to let me log in without changing my password. Our company ERP system also gets upset and used to keep throwing me off, to work around that I've directed that URL down my VPN so my connection originates from the office Internet. However I'm starting to think that to get a fully functional home network on 4G you want to run a VPN over the top of it, maybe something like AAISPs L2TP service.