In addition to all the reasons I mentioned in the 'Kenmo thread, Whirly has the unique Surgilator straight-vane agitator. IMO this one element of Whirly's BD line-up positions it as an outstanding performer. IMO when it comes to occilating agitators the Surgilator is in a class of it's own. In all of it's versions, black Bake-lite with Chrome Cap, bluish plastic "Super-Surgilator", "big-tub" "Super Surgilator" and "Winged Super-Surgilator" you could tell just by looking at them that they were VERY capable of cleaning that load of wash.
BD Whirlys will always have a special place in my heart.
The early(cartriage type) waterfall filters looked so good in operation and like the 'Kenmo's, were not hard to clean. The same could not be said of the "Tragic-Mix" Brush-Type filter that created the unpleasant task of picking that nasty brush clean with a comb, old fork or whatever one could find to perform the task. Most of the Whirly owners I knew, back in the day, simply left the filter out of the machine altogether and used the resevior as a detergent/bleach dispenser only. When washing a load of greasy kitchen towels or greasy work clothes I tend to use shy away from Whirly's because of that neutral-drain. I just prefer an overflow rinse when washing a load of greasy clothes.
IMO no collection would be complete without a BD Whirlpool and I am blessed to have two. My newer one is in the "daily-driver" line-up and it has spolied me since the day I got it.