Still happy with mine. Maybe it is a little slower than the latest models but it depends on what you want to do with it. I don't use mine for games but I find it perfectly usable for web browsing and media streaming.
I have both versions the older one definitely has got more sluggish and is sometime unresponsive . A complete reset appears to sort it out for a while though and then it's pretty usable .
The only apps that get a bit sluggish for me are the google ones, so for this I have disabled auto updates on most of the google apps (just run the version that initial came with kitkat)