I have a Sir Prize and agree it doesn’t produce the best tasting fruit, but there are a few traits I like about the tree.
I tried growing a Hass and a Reed in my home garden, but they both died in my heavy clay soil and I don’t think it was warm enough for them. On average, we don’t get temps in the 80’s till August and during bloom in spring, highs are usually only in the 60’s, so not great for fruit set.
Sir Prize consistently fruits every other year and like you mentioned produces abundantly, even in my cooler weather. The leaves are more resistant to persea mite and stay a dark green. I like the deep color of the fruit and the skin is easy to peel from the flesh and the seed is smaller.
If I could combine those qualities with the fruit quality of the Don Gillogly, I think I’d have a ‘winner.’ Most of the seedlings I planted at the farm are from my 17 year old Don Gillogly tree, which is 5 feet from my Sir Prize, so I’m sure some have crossed. We planted over 60 seeds, so maybe there will be something good. The seedlings are strong growers and the first ones we planted in May of last year are over 6 feet already and were unfazed by this recent heat wave with 100+ temps.
Janet