Ardex K-15

I've decided to use Ardex K-15 to level the concrete slab in my living room. If I just cover enough of the floor to make it level the K-15 will range from around 1" thick to feather edge. But I'm thinking I may get a better surface if I cover the entire slab (13'x17') to some minimum thickness, say 1/4". But this stuff is pretty pricey. I will be having a wood floor glued down after the slab is leveled.
Any strong recommendations for or against feather-edging vs. covering the entire surface in terms of durability?

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file
Upload is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.