What should you get for an upgrade, for any product.. An upgrade should indeed fix any past problems, but for sure should offer improvements other than just fixing past problems. If they have a defective part or design, as did Toyota, You go and lawnbott it should be recalled. It will be just a matter of time that the government will step in and force a recall. This you can count on, for every complaint there are at least 4 more costumers that don't complain, they just quite buying or using that product. Just look at the big companies that have gone out of business or close to it. K mart, Wards, Sears,W T Grants. All of these stopped carrying for there customers...
I don't want an upgrade, just give me one like they claim are running with no problems. When I have a trouble free mower i will shut my mouth, except to say what a good product it is. and I will holler just as loud as I do now.