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Title: Save your money and buy the unheated one.
Review: I had no trouble assembling this perch, and using the velcro to attach it to the windowsill was fine for my lightweight cats. I was looking forward to offering them a heated perch to rest on while they watched birds in winter, since it gets so cold near the windows.Unfortunately the heating element creates a barely noticeable warmth, and it can't be increased. My cats would rather rest in laundry fresh from the dryer. They still enjoy using the perch to look out the window, but I take it down if i think it's too cold out so my older cat won't get chilled.
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