I'm using this card in an iPad Mini, in a city. Previously I've used 3G data cards from 3 (Three) and they've given me a consistent download speed of around 5-7mbps and I'm using this EE card in the same places (where I'm also using a 3G data service from O2 in my iPhone, that also gives similar speeds).
Sadly, this EE 4G card has been very disappointing. Sometimes I get download speeds of close to 40 or 50mbps but, more often than not, the download speeds have been very much lower, often around 1-2mbps and, on several occasions, as low as 0.25mbps. And its not the signal - even when the downloads are very slow, the upload speeds are often (but not always) up around 5-10mbps (and the O2 3G service on my iPhone has continued to deliver a consistent 5-7mbps in the same locations).
So, my problem with the card and service is the lack of consistency of the download speed - really irritating when you're looking something up over the internet, let alone downloading something.
Will I buy this card again? No - I'd much rather have 3G running at a consistently reasonable speed than a very inconsistent 4G with occasional high speed. Perhaps in a year or so, when 4G competition has hotted up and the 4G infrastructure has improved, I might try again....