Yes Bostonwash...
There were a lot of GM and WCI 1-18s lurking around the Phoenix lot where we went in May, and it's obvious that WCI inherited a lot of tooling or already-stamped heads and cabinets from the GM machines. The only difference that was notable between the WCI and GM Frigidaire exteriors was the absence of the GM logo (and later, a little "Energy Saver" sparkly and a differently scripted Frigidaire logo).
On looking inside, however, you'd see either a nice Jet-Cone pulsator (GM) or one of WCI's myriad funky agitators (maybe a ramp, maybe a straight-vane, maybe an angel-wing, or maybe even an oddball one that looked like a one-piece, faux Dual-Action).
It's very depressing to spot what looks like a GM Frigidaire 1-18 in profile, only to pop open the lid and see the stupid WCI innards. ARGH!
Frigilux has had good commentary of the shared and different features of the GM and WCI 1-18s that were around at the time of ownership transition.
--Nate