Upload & Sell: On
I used NPS once, and that was that. The people at CPS knew me by name - my Canon gear was in there nearly once a month (that was a whole debacle...), but their service was fantastic. The one time I dropped my gear off at Nikon I had nearly a two week wait. Thankfully, that was the only time in 4 years that I had an issue with my Nikons. If they were problem-cameras, that would be a serious issue for me.
As a side note, Leica gets my vote for best camera service. They replaced an entire sensor, no questions asked , did it as a rush job, and overnighted it to a friend of mine to get it to me in time for a shoot. And only charged labor (expensive, but not as much as you'd think). Granted, for what you pay for their cameras they better have great service. But I was surprised to see such a small company putting the big two to shame.