Hi Clydesdale,
I summitted via the mountains route so cannot comment on the main trail. With that said, I felt that the conditions were great.
It was easy travel to Upper Boy Scouts lake with little to moderate snow cover. The trail was packed down so we did not have to break trail. From Upper Boy Scouts lake the snow was substantial enough to maintain crampon use. The snow in the chute was solid and allowed for easy travel. Lastly the lakes and streams were not frozen so it was easy to obtain water.
So basically if you have ice ax and crampon experience it was a good winter mountaineering experience.
Hope that helps please let me know if I can answer any other questions.
Here are the pictures of the trip
Lori Williams Mount Whitney