Polycarbonate chairmats are more expensive, but they're worth it. Vinyl chairmats dry, crack, split, develop holes within a year, esp. on plush carpets. Be careful, though, to match your carpet to a chairmat's specs: if carpet is plush/medium/low-pile, buy accordingly. In any case, buy polycarbonate. Vinyl is a throwaway, so often you'd have to buy several at a time. Overstock.com delivers fast and accurately (I previously ordered this exact same chairmat from another online company, and had to send it back, wrong model).
I have purchased another Floortex Cleartex Ultimat Chair Mat for another desk chair area in our town home (different supplier) and found that they are extremely durable and easy to clean. Overstock offers the best price on this mat, so any future purchases will be through Overstock.
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