Stayed a couple of days last week on our way to Scotland.  Site is so close to the A1 and so easy to stop overnight.  But really is worth a longer stay to take everything in.  We have been before many years ago and the site has been upgraded and is splendid now with lots of hardstandings as well as grass and for those who need the super pitches.  The wardens are great and very friendly especially when you've booked the wrong type of pitch!  Wifi is Silver but we found it really good, a bit slower than the home fibre but with all the vans there it worked well for us.  We spent a day at the Beamish Open Air Museum and luckily had good weather and would highly recommend it for all.  Might not be quite so good in school holidays but we had fun jumping on and off the various types of trams.  Can highly recommend the Tea Room which is upstairs in the Village, we had lunch and went back for tea and cakes as it was so good.  On a previous visit we had used the Park & Ride, which is within walking distance from the site, to catch the bus into Durham.