I have used Beronet cards with good results, as I had several from their use with many Asterisk servers I had prior to 3CX purchase of Askozia and our migration to 3CX. I'm only using one at this point, for an application in my home lab as I've moved to using Patton gateway's for all my client deployments. I second the previous statement of favoring gateway appliances, as we do as well, with especially good results with Patton hardware.
However, I have had good results with the Beronet PCI cards in both FXS and FXO roles and felt the need to post to this to brag on how great their support is. Including having their dev guys look at a weird use case I had where I wanted to autodial on offhook status, which doesn't seem possible with a PSTN endpoint, the way it is with a SIP endpoint device as I have done with Snom hardware.
Best wishes...