Been with ThreeUK for the past 4 years, finally pull the trigger and moved onto Vodafone.
I mean, it was great when it had One Plan and the 3G (H) era where 3 was the best and fastest of all networks, I remember getting 30MB+ speed a few years ago, but their 4G failed me, especially in London, it's pretty much unusable, constantly getting sub 1 meg speed test results, come on Three UK, you are truly going backwards.
I am sure they are good in rest of the country, but last time I was out of M25 (of UK) was a birthday party in Sunderland last year, so it is not important for me
As regards to Feel at Home, having travel to the EU almost on a monthly basis, Feel at Home was a great product when it was innovative and it did disrupt the roaming market, but those restrictions on VPN, streaming and the mess of routing, plus compare to my pair's Vodafone 4G roaming, I would preferred to pay £3 per day for faster speed, better VPN access and some occasional Youtubing, not to mention with my new Vodafone contract, I will get 2GB/month EU data for free.
So long Three, it's been great, hope all the best, maybe see you in a few years!!!