Are gaming mouse mats worth it?

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I have a G502 coming and I was just wondering if proper mouse mats are worth it, I have a normal material mat that VMware gave me.

 

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yes! I've got the OcuK desk matt! it's huge but well worth it! also it's so smooth with my Razor Deathadder

I don't want a massive one, one 25cm x 25cm would be fine.