I use these, got the 4 test pack. I did our first worm count for our two and sent their samples off on a tues 1st class, couldn't belive it when I checked my email on weds lunchtime to find their results there. Impressive!
Just bought the Westgate pre-paid pack from local tack shop - just waiting for ponies to poo to collect sample from each of them but as they live out 24/7 will have to hang around for a while. Seems like they do dozens when I'm not there but it's like watching a kettle (for those that know the old saying) when I am there.