The newer model SR9's have a fairly nice trigger, the same as the SR9c. Older models with a round mag release will normally have the second gen trigger with the trigger safety (like a Glock) unless they didn't go back for the safety recall. That 2nd gen trigger is mostly just a hard pull but short. The new one (still Glock safety like) is pretty light and still short in pull, that gun will have a "D" shaped mag release.
Here's a pic of my original SR9 (right) before I had the recall trigger installed.