Sungold is a lovely tomato. I grew it regularly 20 years ago but the seed became unavailable, and I moved on to other varieties, and never found my way back. I've used grafted tomatoes in the past (out door Crimson crush for their blight resistance) and the were as you have said amazing. This year I switched to the Quadgrow system in my greenhouse for both tomatoes and chillies. Had problems with the feed (Nutrigrow) so switched back to Tomarite, and adopted the hydro-culture method of using electrical conductivity to assess the amount of feed necessary (using a conductivity meter). The results have been exceptional. An abundance of huge tomatoes, and a superb chilli harvest - even the Trinidadian Scorpion has been fantastic . BUT, you have whetted my appetite, and I will be growing the marvellous Sungold next season.