Before getting my car I had an S-line for a weekend demo, then an S3 for an afternoon, neither had electric lumbar support and I could never quite get comfortbale - lower back was never quite comfortable.
I specced it with mine, and have got it set right for me, but obviously never adjusted since then. So, get a test drive in one without elec lumbar, an extended drive if you can - if you get comfy - no need, if you can't it's a worthy addition!