I am a residential GC who uses a knife as a primary trade tool on a near daily basis, M-SAT. I generally sport a fixed blade (SAR5, Fox River) during most of the construction process, transitioning over to a folder (SnG Tanto, XM-18) when the job is near complete. Fixed blades earn a "whoa, sweet" response from most contractors, folders usually get a "wow, nice" from prospective buyers and agents.