I am growing both Sturon and Red Barron again this year as my main crop of onions, both from sets.
The first year I planted onion sets they did quite well. Last year I took to starting them off in a compost mix in cell trays with added organic onion fertiliser and fish, blood and bone feed. When I came to plant them out, they went out with really good root systems and I got some really good onions last year with this method. Carrying out the same this year, I hope for a good crop again in 2015.
Some of the sets I have bought are huge so I hope I will be able to get some big onions from them.