We bought one this year and have used it twice. It's not difficult to use, just difficult to understand. You see lines on the screen and solid lines from top to bottom mean pregnancy, BUT you have to have the probe in the right area. A full bladder can "supposedly" show a pregnancy that isn't there.
We ultrasounded several of our mares and found them in foal....then had several of them come back into season. Were they pregnant and absorbed??? Or did we read the machine wrong??? There's no telling since we didn't get bloodwork done.
We could have returned the machine, but we waited too long, so we've got one that we don't feel comfortable reading. Oh well....wanna rent it?