I have 350pe (I think-it's the middle of the 350's). LOVE it. I don't think I have ever used the push button sewing function. Maybe I need to figure out its benefit! And I am not sure what the "kick back function" is? I have had my machine for 3 yrs, and it has been in for routine maintenance twice. Due fairly soon for its next checkup. I don't find the extension table to be flimsy, and have FMQ'd a queen size quilt. Changing the bobbin is not a huge ordeal for me....it would be great to have bobbin access from the top though. The harp is not huge....if I had the money, I would purchase the machine with the largest harp that I could! That being said, I love my 350 and it has served me well. Good luck with your purchase!