Yes! I highly encourage my cliets to purchase a HRM that holds saves past workouts. If they are more data savvy, then I will go with the client and help them choose the right peice of equipment for them.
You have to understand, there are a few reasons why I do this with my client;
1- The client has a better understanding of rated percived exertion and their heart rate
2- The data gives feed back and allows the client and trainer to progress accordingly
3- Lasty, if your client can’t get to the gym, you can always give them other work that works with the HRM.