I have GEM and have enjoyed fruit from it. Fruit is very good, turns black when ripe. Not as big as Hass and certainly not as vigorous. I have so many different varieties of avocado and GEM is OK in comparison to others, but really you can't beat a well-grown Hass here in California. The GEM is a seedling of GWEN, grand daughter of Hass. Much smaller and slower growing than a Hass. Carmen is growing rapidly and hopefully this year we can see if all the publicity is correct. Sure is a strong grower. Lamb-Hass is also growing well and quite productive here in the Central Coast.