You can't beat the aussie avo's but I am biased and they are not the best representation of aussie avo's either! BUT the kenyan ones - put them in a brown paper bag in the cupboard for a few days adn they will ripen nicely but you have to be prepared coz if you want guacamole that day they wont work obviously!
I am not a fan of the kenyan ones either. They are watery and stringy. Every now and again I buy one (they are a 1/3 of the price) but I am always dissapointed.
Also, if the avo's are hard, don't bother doing anything with them. Put them next to some bananas and they will ripen in a couple of days.
You can make guacamole with them. You just have to wait for them to ripen first. You'll know when they feel slightly soft. They are good and a lot cheaper than the other ones.
DH has just come back from Spinneys with the hard green avocados and expects me to make guacamole with them. I normally get the brown wrinkly Australian ones to do guacamole with and can't see how I can do it with this variety. Is it possible? If not what else can I do with them?