everything and i do mean everything is fresher tighter punchier and sweeter.i was expecting a better amp especially considering mine was getting on a bit but in its day it wasnt a bad amp at all.the leaps and bounds that are the sound quality difference in both amps is superb.but there are a few things i dont like compared to the 830 1,those sill bannana plugs at the back,the way you have to pop the plastic out to fit the connectors into them is a bit dodgy imho. 2,the remote,jesus that has to be one of the ugliest remotes and colour schemed buttons i have ever seen lol i mean yellow,clear,turqouise all on a black remote 3,no flap for the front av inputs. 4,the headphone jack,i dont like the idea of having to plug in and out to get sound out of the amp.on the 830 there was a switch to let you choose,which i prefer. 5,two power buttons what the fudge all these are small points considering i payed a lot less than i did for the 830 about 4-5 years ago but i still have to point it out. also does anyone know if i can change the display to show the input channel eg DVD instead of sur. standard? if not this could be number 6 lol.