I have moved from 175mm to 158mm then back to 175mm.
At first, yes, it feels different, but it doesn't take long to get used to it.
Personally, I prefer the longer 175mm cranks.
Ive had the X-lite cranks... they're good... but I snapped 2 arms. The first because Im a fat b*****d and the second because I filed a notch out the back of one to clear my frame with a short bottom bracket.
They seem fine for the majority of people.
Good luck!