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My understanding with flaxseed was the fresher the better, so buy whole seeds and blend it yourself and use ASAP otherwise air, light etc will degrade it. I'm sure any is better than none.
inchpincher-
I wasnt aware of this. I used to blend my own until they started selling pre-blended organic flax is most supermarkets here.
I also use flax as emusifier for salad dressings:
EVOO
Vinegar of your likings (I am on a streak with sherry vinegar myself. Great stuff)
Flaxseed
Bit of water
Salt and freshly ground black pepperThis is a good simple base which can be used as is or built upon. I dont have any exact measurements. I like to add stuff like shallot and garlic, fresh herbs, (macadamia) nuts, fresh citrus juice, sweetener such as honey or organic cane sugar, tomato puree, spices. Depending on what you like and the ingredients of the salad basically anything can go.
It works well in a food processor, but a blender might work as well for larger batches. I use my immersion blender with a small food processor attachment as it works best for smaller batches.
Note that the longer you blend it, the thicker the consistency gets. All the way to thicker than mayonnaise.
Machine
I buy 500gram bags so they dont last longer than 3-4 weeks. It has never spoilt outside the fridge and neither I have read the instructions. YoLo.