Both my i7s are fast but when browsing the web there's always a period of time when things slow to a crawl when web browsing or the never ending updates that tie them up at some very inopportune times.
I was surprised how smooth and hassle free it is. I use an ad blocker. I will still need my 2 i7s for work but I'm sold. If I'm browsing the web to relax I'm using a Chromebook from now on.
I know most people think of them as less than great but both windows and OSX have gotten so blotted that it slows down even the fastest CPU. Google has done a great job at optimizing the code to work well with low end CPUs. Both Apple and Microsoft should learn from it and create a web only OS.