Just went Tuesday, crossed just after 4pm. Came back Wednesday, crossed about 1pm. The traffic on the highway was very light. On the way there I waited only about 2 minutes @ customs

She was very fast questioning us but as soon as I said why we were crossing (Miley concert)
she was really nice . On the way back, waited about 15 minutes to get to customs, guy there was equally easy. Again, said we went to Miley and he laughed and said he'd had lots of cars back that day from Miley.
On the way there, I did the Modeland Road detour, just to be safe & for curiosity's sake, and it was easy to follow if you see it backed up.
I'll tell you where there are traffic/construction issues-Strathroy. If you have to go through Strathroy allow extra time because, en route to Sarnia, it was down to one lane for a significant amount of time. On the east-bound side, it was not nearly as long as the west-bound side.