I have an association with a Hastings second hand car yard that purchases at least a dozen "Ultra" automotive batteries every month and certainly have had no duds at this stage. I also have several of them in the multitude of vehicles that I seem to have gathered over the years.
However, have have no experience with their deep cycle batteries as we still have the two original 100amp AGM units that were supplied new with our caravan.
I do know that under the "Ultra" label they supply lower cost 6 month warranty starting batteries as well as heavy duty units with a 2 year warranty so in effect you get what you pay for.
We buy ours locally in Hastings from a small "one man band" operation called "The Battery Doctor" and get a great deal.
Hope this helps,