Did the Nene a couple of years ago and was pleasantly surprised as we had a nightmare trip down there twenty years ago, which is another story.
The Northampton arm is hardly a trudge, it's nice to get back to Narrow locks after the GU main line.
The old problem was the bloody awful bottom gillotine gate mechanism but a large percentage have now been electrified and some convered to traditional gates. However the unelectrified ones have been fitted with aluminium wheels to operate the gillotines which are a pain.
Have never felt the need to get the anchor out on the Nene.
You will need an EA 'Abloy' key to operate the Nene locks, best buy in advance if possible, we had to beg one off a boat coming up the Northampton Arm once as the boat yard that sells them at the top was closed!
Mooring places are not that frequent but have never failed to moor up close to where we wanted to.
Tim