If I could improve my washer I would wish for a good lint filtering system, some loads that I don't separate fabrics.....oh my goodness. I bought a brush to sweep off the extra lint, still line dry most loads. I hate, hate, washing only 2 or 3 items because of the water usage so I save them till I have a load ready.
Also, a longer spray rinse between the wash and rinse cycle would go a long way in avoiding a 2nd rinse. A load of towels always takes two rinses, sometimes 3 depending on the detergent.
I purchased a 432 model a couple of years ago. I still feel the pro's still outweigh the cons on this washer. A friend of ours bought one also, and it tore up her delicates something awful, I looked at her bras and it looked to be the agitator catching the bra straps between the base and the vanes of the agitator. I recommended to buy a wash bag and put them in there, she's had no problems since. It tore up some of her nice clothes and I felt bad that I recommend the machine to her. Needless to say her feelings toward Speed Queen differ from mine. The new agitator may solve the problem.
I'm not a fan of neutral drains, feel that they pulled the dirty and soapy water down through the clothes, hence the necessary spray rinses.
All in all, its a good machine, though it can be expensive to operate as I experienced with my Dad's illness this summer.