Welcome to the board
I too was seriously considering a Bernina, mainly for the BSR. However, when I tried it, I hated it - I found the BSR sluggish and slow. I found I could actually quilt better
without it, much to my amazement, lol. I didn't think it was worth paying that amount of money for a feature I may not even use.
Another thing that put me off was that you
still needed a walking foot, something I'd never needed with my Pfaff QE 4.0. - one of the main resaons I bought it. Although the dual feed is similar, they're not quite the same - Pfaff don't even make a walking foot (except for their Grand Quilter machine).
In the end, I decided the main feature I want in a machine was an auto-pivot as I do a lot of appliqué and ended up buying a Pfaff Performance 5 - never regretted it. I love the Sensormatic mode for FMQ (where the foot 'hovers' above the fabric). Quilts like butter.
As the others have said, decide on how it's going to enhance your sewing experience and whether they're worth it to you.