I use a C7700 Pro with a 50mm EL Nikkor and like it a lot. The only couple of (very minor) gripes are:

1) It'll only go to grade 4.5 which can be a bit of a pain when split grading or trying to punch up a flag neg.
2) A slanting column and a bigger baseboard would save me from having to build a shelf to mount the thing on. (Pure laziness!)

Apart from that it's a really nice unit. No gripes on the Nikkor at all.