Haven't noticed any difference between the two in my TDi. Although, as jbs2472 has done, you do need to give it a couple of tanks to let things adjust and to allow any trace of the saver stuff to go. As with a lot of mods that are supposed to make a subtle difference it's hard to tell whether they're working or whether it's just you imagining it.
On the remapped Mk4 Golf I had to use V-Power or it'd smoke like red arrow, so there must be some difference in the fuels. Also, supermarket fuels were even worse in terms of smoke. Sainsburys was the worst for some reason. These aren't just my findings, but universally agreed on the UKMKIV's forum.