@SamsungFanBoy : I had till quite recently the Huawei Wifi Pro (E5770s is the unlocked variant). Great device and I have run my home network off it since it had an ethernet port. 4G speeds were great and stable but as always, its area dependent. Mine were around 12-20Mbits download depending on the time of day. About 8Mbits upload I recall. Great battery* in it and lasts most of the day but the device is now superseded so quite cheap to buy on ebay. The latest models from Huawei seem even better but extremely hard to get in the UK.
Whilst the Huawei is a great device, I had only two issues with it but not a major set of problems - wifi is permanent and the admin interface is basic and functional. Set and and leave it is the best option. Sadly my unlocked one broke - doesn't recognise the sim card - so is now a portable power bank/router. Replaced it with a Zyxcel LTE3302 which has the advantages of dual ethernet ports, the ability to turn off wifi, can attach aerials and if you can find it, run off a battery! Only downside is that its not pocket sized.
The Netgear M1 o2 are selling looks intriguing though.
* I work from home that suffers the occasional area power cut so a battery powered 4G router means I don't have to explain why I'm not responding to emails!