A Wurtz I planted in the summer of 2015 bore 18 avocados this year -- plucked the last two today (they were pretty well hidden in the tree, so I missed them earlier).
Have been eating them the last month. Give them 7-10 days to ripen after plucking them off the tree, and they're fine.
My Wurtz isn't as fast-growing as someone on this thread mentioned. It's about 8 feet tall now.
A Day avocado planted at the same time is a bit taller than the Wurtz, and a Lula is much taller and wider.
But they all take well to pruning. I took a couple of arm-sized branches off the Lula a month ago, and it's putting out new growth in several spots - not just near the cut, but all along the branches. The Lula carried 60 or so full-sized fruit; have already eaten some, and letting others stay on the tree longer to see if there are changes in flavor if I harvest them later.
The Day had just one this year, but it was delicious. Nothing like the Hass, more "watery," but tasty nevertheless.
All the avos are planted in the ground.