Instruct: Classify a given Amazon review as either positive or negative.
Query: decent quality, good heat, durability may be an issue longer term

They heat well - but becasue there is only one setting, it gets hot, you have to plug and unplug it on long trips to modulate heat.They are not pretty, and I don't know if they will hold up for more than 1 winter season, but they are great to have on cold mornings.