We want to install engineered hardwood floor over the concrete slab in our basement. Haven't decided whether to do a floating floor or glue-down. Moisture is not an issue. What is an issue is that the floor is not perfectly flat. It's pretty good but there are several high spots throughout where I can balance a six foot level on them and have up to 1/2" of clearance at the ends. This is way beyond the tolerance of the flooring documentation (1/8" over 6'). Theoretically, I could use a leveling compound to bring the floor up to these high spots. This would be expensive and painful. We're talking about 800 sq ft. If I could identify all the high spots, I suppose I could try to grind/plane them down. This seems painful as well.
My question is: What would you do? Give up & just do carpet or spend the time/effort to get this floor flat? Other suggestions will be considered as well.