Yes, I have, and was very happy with it. I did do the usual raw beef mince for the first couple of meals but then used the NI weaning paste and subsequently graduated onto the other NI minces for variety as the pups got older. No upset tums.
It's very smooth, like toothpaste really. I've raised our latest litter on the paste and then moved on the the Puppy. No problems at all, the previous 2 litters, I had tummy trouble at weaning time but this time, no trouble at all and the pups are good eaters :-)
I used it and OMGosh did they tuck into it straight away!! Two of them about took my fingers off when I gave it to them on my fingers to get them started and then they were straight into the dish the first day. I would absolutely recommend it. They then graduated to the NI Puppy food as well as mashed puppy complete.
I would always do this now rather than the raw mince - it was SOOO easy and they absolutely loved it.