I have not myself used it, not needing to (we ultrasound per rectum). My experience is limited to what others have said - which tends to vary quite significantly - and perusal of the owner's manual. One observation that can be made is that they can be bought quite cheaply second-hand as there seem to be quite a few for sale (there are some listed on this board if you do a search).
My personal opinion is that reliability is going to vary dramatically with breed/species and individual operator. Additionally, per the manufacturer's owner's manual, either by presentation or omission, the unit:
Cannot be used for ovarian evaluation;
Cannot detect twins (which is of great importance);
Is not going to be reliable in post-partum mares;
Is not going to be reliable in cases of EED.
In other words, it is limited to pregnancy detection and may not even be reliable in all instances there.
It's your call...
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