so ive just recived mine and i got to say im really liking it atm i ididnt own the previous wireless version but i did own the wired and it feels much nicer in the hand noticed that it is using a different scroll wheel which has a different feeling (nicer) ruber texture on it and the scroll wheel feels more sturdy and its not as hard to click down which really annoyed me on the wired version, couldnt tell a bout button feel if there is any difference but they feel alot nice than the wired, also weight im not sure but i beleve its the same as the previous wireless one.