I loved the 1/4" foot/guide with my Janome.
I had perfect seams.
The Bernina 1/4" I have a love-hate relationship with it as I find I cannot get the perfect seams.
A hair too wide, which then means blocks do not make to the right size ..... easily.
Knee lift ... the 1st machine I got it with, I avoided it.
Hated it when I tried it, but I could see the advantages.
Plus discovered, because I had first learned to sew with a knee pedal,
I reverted to thinking it was for that purpose. Talk about messy sewing!
Finally I "forced" myself to use it consistently while working on a project.
Yup, I soon fell in love with it.
To tackle the knee pedal issues, I now run the foot pedal with my left foot.
Knee lift with my right knee.
Can't live without it and will never buy a machine now, without it!!!
As for the 1/4" foot issue ......... I wish I could get that back to being a total love!