Hi! Welcome to 3FatChicks. I have used a treadmill for years, but for walking, not running. If it's going to be used for running you need to make sure you buy one that is made for running. It will be much more costly, but if your wife is used to outdoor running she will not be happy with the ones made for walking. I suggest she go to a store than sells them and try out the displays.
Also, if you have a knee problem, I don't think a treadmill is going to work for you long term. I really don't know much about the softness feature. For those will a knee problem I recommend a good Elliptical Trainer. It can give the effect of running, but without the constant pounding that irritates the knees. Once again, I recommend trying one out in person before buying. It should have an adjustable stride since more than one person will be using it.
Continue to do your research to be sure you're investing your money in something that will be useful for years to come. Good luck to you!
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