I used DVMax while working in a specialty hospital as a radiology technician. We had daily appointment slots so I was interfacing with DVMax on a hourly basis to check appointments, patient history and referring veterinarian documents, evaluations, and lab work. We also used DVMax to directly fax patient reports to their referring veterinarians which was very convenient during busy appointment days.
It was also easy to learn and the functionality was intuitive. It was the first veterinary software I had ever used and I thought it was easy to pick up.
Now my hospital uses Cornerstone, and the interface is very dated, which in comparison to DVMax gives it a low-tech feel.
I didn't like that DVMax (at least when I used it) did not have the functionality (or it wasn't enabled by my hospital) for treatment sheets. We had patients in hospital daily, and had to refer to paper-based charts for treatments and constantly import data such as labwork into the system (we have a mix of Idexx and Heska systems in the in-house lab)