We moored in NWM1 and my travelling companion moored in NWM2 last week. The other bookable moorings were unoccupied for the two days but other random boats were moored on other moorings.
I was disappointed that we had to use mooring pins (with plenty of buried concrete!) due to the lack of rings/spacing of the existing mooring rings. I would describe the arrangements as "no frills".
You will need to fill up with water by the cafe, before dropping down into the basin or on the Weaver if using the MSC. If you need an Elsan, that's hidden behind a portacabin on the opposite side to the cafe.
One plus point was finding "Home and Dry Laundry" just up the road. A friendly and quality service at decent rates and turned around in less than 24 hours.