Smilers not a rough ride. It's not like colossus where I find the whole thing consistently painful, but certain jolts hurt a bit, especially on certain trains (one of them literally feels like it's shaking itself apart).
As for it getting worse I'm not sure. Some rides are worse than others. When I did it the day after it reopened it felt as smooth as nemesis (and it didn't feel like it was even being trimmed, launched out of the seat on the second air time hill). When I went on a few weeks ago though, it was noticeably rough, with some normal guests complaining as they got off. Wasn't too bad, but noticeable and had to brace. I just hope they sort that one train out though, felt like it had square wheels.