No, this was my first one.
I've previously taken the view that if a monitor looks OK then it is good enough as my images aren't generally printed (except a few astro-photos) and the chances are that most of those viewing said images will be doing so on either uncalibrated monitors or with software such as IE which seems incapable of correctly applying an ICC profile. For example, images which display beautifully in Photoshop using the AdobeRGB colour space and which, after "Saving for the Web" as sRGBs display with very similar colours using either Firefox or IrfanView are way too saturated when viewed with IE or with the Windows 7 screensaver. I'd sort of hoped that, despite searching for and failing to find any configuration errors, the calibration would correct some obscure Windows configuration error but that didn't happen so I'm forced to conclude that Redmond generated software doesn't coexist peacefully with my wide gamut monitor.
Only a problem when I share images on the web and I can get around it by re-saving a JPEG using IrfanView but that isn't ideal.