Granite countertop overlay versus replacement--thoughts?

[Zach Ziskin]

Hi All, 

I'm rehabbing a SFH right now and the kitchen countertops definitely need some updating. I was looking into going with a granite overlay on top of the existing countertop, rather than tearing out the existing countertops and replacing with granite slabs. Does anyone have any experience with using overlays instead of full replacement, and thoughts on the advantages or disadvantages? Thanks.