There's virtually no difference from going from 16" to 17" and there's still plenty of tire sidewall around the rim to withstand an occasional curb jump or pothole. The SE sport wheels actually only weighed in at 19lbs.
It's mostly an aesthetic mod and it does help the look and gas mileage doesn't seemed to be affected.
The day we brought it home
Original set that we had an issue with one wheel and since had been discontinued.....
....then the set we settled on as the replacement. It seems the black wheels make the size look smaller and slightly prefer the gunmetal but the black is growing on me.