I love the knee lift and have just started using my left foot with the foot pedal. It's a little awkward but I'm liking it. I think I will get used to the left foot thing without too much trouble.
I have found that the knee lift on my Brother machine is easier than the one on my Bernina. It feels like it's closer? Not sure and did ask my dealer. I didn't follow up with it but I think I should to make it better for stitching with my Bernina machine.