I don't have any knowledge about the Babylock Jane, but have the Juki TL2010 and love it! I don't use it on a frame, I have an Arrow Gidget II table. I use it for piecing and quilting. I also have a Viking Sapphire 830, but I don't use it very often now that I have the Juki. I think the harp is a little wider on the Viking, but the opening is more spacious on the Juki at the top and needle end, so the visibility is better.
The Juki was perfect right from the box. I haven't had to mess with tension at all. It has a needle threader, but I haven't taken the time to learn it yet. I know there's a you tube video, but I have not gone back to it. For now, I just thread the needle the old fashioned way.