it wont ever be like your benelli, your comparing a 1K gun to a 1.6K gun, the only outstanding trigger on a semi auto that I have found sub 1000$ is on the Fabarm XLR, and thats still over if you dont buy it on sale.
The only weakness on Winchester shotguns IMO is the trigger group, O/U including, Winchester does not know how to make a nice shotgun trigger.
I dont own an SX3, just tried a handful of them, passed up a good deal on a 101, and still own an SXP.
The gun will last forever, but you will be replacing springs and the hammer every 10000 rounds or so, my SXP has about 8000 through it and the hammer has a nice indent in it.
There should be a couple allen screws on the trigger group, i've noticed that if you tighten them up it will eliminate a lot of the play in it. Or you could have a trigger job done on it if you have some extra coin in your pocket.