line vs progressive lenses for sunglasses

I've been using progressives for a decade or more. Suntiger
progressives for soaring, and though they're pricey, they're worth it
on a bright day of soaring. Progressives get some taking used to -- the
first Dr I went to insisted on calling them "fuzzy focus" lenses, and
many's the time I agreed with his assessment. But you do get used to
them, to "pointing your nose at what you're focussing on," as another
Dr told me, and I don't think I could go back to lines. You'll still
trip on steps and other items on the ground -- down in your "reading"
zone -- with progressives, but you don't feel like you're bobbing in
water, half above and half below. Fred