I don't really find it to be THAT different. Animations are slightly faster, though many of us won't notice with reduced movement on.
Little bounce when you open the notification and control centers. Most of us won't use the features to outline buttons or dark keyboard.
Otherwise I notice no major difference. 7.0.4 worked great, so does 7.1b2.
what about crashes? anyone faced up with safari crashes? because on 7.0.4 with 5S i get randomly safari crashes and logs of low memory while with iPhone 5 in one years never got this
That is an awfully big statement. What exactly do you feel is SOOO awful about 7.0.4? I've had great luck with iOS 7 since the early betas.
I don't use Safari much but I haven't had it crash on me yet. I usually just use the google search app and then open up a page in Safari if I want to read it.
I haven't had a single device reboot since updating to B2.
I've only had one respring on my iPad air since installing beta 2, and one Safari crash, but my 5s has been flawless. I wouldn't call it ready for the general public yet, but it's damn close. Once they iron out the odd glitch that still exists it'll be nigh on perfect.