Solids from Surface - "Edge Tolerance"

[Slick]

When creating Solids from Surfaces, after you select your surfaces and the Edge Tolerance comes up, does this just apply to filling the gaps in the surfaces, or will it start to alter all the surfaces if you set it too high?

 

i.e. A 6 x 6 cube with 0.250 fillets (gaps in the fillets), and you set the edge tolerance to 1.00", will this possibly change the cube to anywhere form 5 x 5, or 7 x 7?

 

Is there a way to tell what stayed the same? and what was altered?