Definitely worth it - even if the pigs get wise to it, you can still always get the injection in, and in my opinion 100 times better than a Slapshot with all its air bubble problems. Could not be without it now. If you are doing a high volume injection on a large adult pig, for example Noromectin (wormer), its worth using one of the very large needles, gauge 13 or 14, to minimise the bottleneck effect of all the liquid going very fast down the narrow tube of the needle. Tamsaddle