Spectraview does more than create a profile when you calibrate an NEC display. One of the advantages of the NEC is most of the color controls are the display itself. While Spectraview does create a profile that is used it's just a small part of the overall adjustment, and you can't just "switch" profiles and see the difference. When you change settings with Spectraview you will see the display go through a serious of adjustments, all independent of the profile.
I tried mulitprofiler but found spectraview gives me a better profile and more control. Since that's the reason I bought the display I wanted as much control and accuracy as I could get. I have more than one setting (ex. sRGB, 6500 at 160 cd/m2 for web browsing, Full spectrum with custom white point and 118 cd/m2 to match my printer)and can switch in a few seconds.