Novices and newbies discussion

Hello everyone. I could use some guidance here. My Beloved has a coworker who is married and asked Her for ideas to add some excitement to their intimacy. Without going into specifics, she mentioned they are fairly adventurous. She wanted my opinion, so I proposed getting her friend a chastity device to try out. Typically, I advise folks interested in custom devices, but this situation feels distinct. It has been quite a while since I wore anything besides my Jailbird, meaning I lack direct experience with models suited for newcomers. Additionally, W/we are buying it ourselves, so spending $300 just to test the waters isn’t ideal. So, looking for recommendations. Thank you beforehand.