I found a Colorstar 3000 on ebay and bought it. It is an older model with the bigger probe. The manual is also more primitive than the one referenced above.
I put it to use this weekend and had good luck matching colors with it. I did have trouble with it not being sensitive enough to measure some snow in sun (dense part of the neg). This only required an 11 second exposure so it doesn't seem like it should be a problem. I got around it by flipping the brightness lever from low to high to take the reading (and then did the same thing to match on the other negative).
I also had trouble measuring the density of the gray strip to calibrate it. Do any of you have this problem with the probe not seeming very sensitive?