I bought a D170 a year ago. Now the new E series is out. I was walking into Lowes and saw an E180(new 54") . I like the new side by side forward reverse pedals. Gives a little more foot room. It has a big RIO button but appears to work the same way.
And of course the quick change oil filter. Other than the quick change the changes are minor and perfectly happy with my D170
There could have been other changes but everything else looks the same.