I think basICColor is better.
SpectraView II software can create ICC v.2 matrix-based profiles only. basICColor display software can create ICC v.2 and v.4, matrix-based and LUT-based profiles.
Probably at this time, a good move on the part of NEC. V4 profiles have produced issues with various software products, until we have full support (more true V4 profiles for working spaces), its questionable what a V4 profile brings to the party.
LUT based vs. Matrix profiles with a high bit display are a questionable issue.
In terms of the custom mated colorimeter, if you don’t own such an instrument, by all means get it. But when I compared the measurements from a non custom filtered i1D-2 to a Spectrophotometer, the differences in the white point I hit was CCT 500K or so. And considering that the value you hit doesn’t ensure a visual match, that you probably do need to alter the values to get a match, I don’t know this is a big deal. IOW, if you ask for CCT 5500K and the colorimeter is off 500K, its possible you’ll get a match and its possible you will not. You’ll have to alter the values until you get that visual match so you are seasoning to taste with either instrument. But again, if you don’t own a colorimeter, by all means, get the unit with the tuned filters. And hopefully in the near future, we’ll see newer hardware that allows the filter data to be updated (perhaps from the web!).