My experience has been that I get better results from an ICC profile when data is measured with a UV filter coupled with Monaco Profiler's gamut mapping than I do without a UV filter using ProfileMaker with its OB correction feature. I simply like the separations I get from Monaco far better. From a proofing standpoint, we're using GMG with an ICColorUV with fantastic results. When the target data has been measured without UV (TR001 for example), I'll create the profile without uv filtration, but merely to obtain a better numerical match. Visually, the difference has been negligible between a uv filtered profile and no filter profle. Of course other's results can and will differ from mine, but honestly, you can get good results either way...unless you don't.