Currently the familiar agility edge gives you the dodge skill at a percent equal to your dex while fighting with your familiar. So 20-25% depending on your race assuming you max it.

In the most common use case (humans) a 20% dodge with 20 dex is going to dodge like 1 in several thousand attacks.

There are 9 non quest familiars, 3 of them are a really really bad idea to use in PK due to their frailness (even with edges).

If this edge was as expensive as keys to success I suppose it would be cool but it is in the mid tier in terms of cost for so low practical use it really is kind of a waste even for an arial.

Simple change would be to just triple the dodge % you get.

Cooler change would be to make this function similar to how a bonded warrior parries for their bond mate and at a similar rate as that affect (except it would be a message about your familiars senses warning you of danger and you dodge).