Hi Kev
The trees grown from seed will revert to their original form, i.e. the wild and bitter sort. These are fine if you want to use them for baking etc. but are really high-powered in terms of taste.
They also contain a slightly higher proportion of the cyanogen found in all almonds, other nuts, apple pips, cherry stones, nispero stones etc. but you can't really eat enough to kill you because of their strong flavour.
Best advice is go buy some standard stock from a garden centre.
Hope that helps,
Simon

You can use the ones you have grown for grafting on a soft wood cuutting from a tree you know that has good fruit.
Some trees from seed will be ok,wait three years then you will know

All trees now are normally a one year old root stock( can be wild or disease resistant)with different varieties grafted on when you buy them