Yes, it does work accurately over the season but you need to make sure that everything is square and centred properly and nothing is leaning on it or otherwise obstructing it. When you read it you have to give it a little bounce because it can stick a bit. Also, if you have a very heavy crop you need to take the honey off a couple of times or it can become unstable if it gets windy.
I used an ordinary Salter bathroom scale and had no problems with it – I think age and rust got the better of it eventually.