Within the last week or so, there was a nice long thread on the benefits and drawbacks of various brands of booties. I've searched and can't find it. The general conclusion was, "If you're serious about cold-weather riding, it's worth getting full-on cycling boots."
In particular, there were comments about PI AmFibs (I believe) to the effect that they tend to *tear*. I think the gist was, the opening that stretches around the cleat isn't big enough, and the pedal squeezes it against the cleat over and over (each time you re-clip), which leads to deterioration, and then you have to trash the bootie. Also, that cutting it to make the opening larger was a bad idea.
Does anyone remember where this thread is? Or have tips as to <$50 booties? I'm riding this winter for the first time, and loving it, but my feet are cold in my regular shoes + toe covers! Yet, I only have $40-50 to spend on the deal. (I need boots that work with "clipless" cleated shoes/pedals.)