I just downloaded it a few days ago and have already had to restart.
I played through Classic on EU and, while it certainly wasn't easy, it didn't feel insane to me. I tried playing EW on classic...HOLY shit. They have seriously ramped up the difficulty curve. Missions seem to come at you much more frequently than I remember them occurring in EU, I was finding myself more and more often having to chuck rookies into missions simply because, even with the upgrade to make guys heal faster, half my vets were still injured and we'd get hit with another mission, then 4 days later we'd get hit with ANOTHER mission, it's insane.
In EU, I remember having beam weapons and carapace armor when I encountered my first terror mission; this time I was still sporting body armor and regular weapons, and thanks to all my vets being injured, I had to chuck mostly rookies in. Needless to say, the chrysalids absolutely slaughtered my entire squad, and that's when I realized that this campaign was probably over before it began.
Still, it's X-Com, and it's still awesome, and I'm still gonna keep playing it.