No, I haven't tried the Nite on my cdp, but have heard good things about them. I also have the Granite 657 cdp and have found cords make a significant difference. While the DIY cords I have tried provided some improvement, they are not in the same league as the better cords. I wish they were, it would save me some money.
The best of the lower price cords I have tried on the cdp is the Syn. Res. A/C Master Coupler which is found regularly used for <$150. The latest cord to provide the best improvement in my system on the cdp is the Music Timbre, from W Enterprises NW. It is made from a gold/silver/copper alloy wire.
The Silent Source Signature, also from Walker Audio, is highly recommended by a friend who still uses the Omega Mikro as his favorite.
Another friend swears by the Foundation Research LC-1.
There are so many choices it can get confusing, but one good thing is most companies have trial periods so it's virtually risk free.