I'll be co sleeping with baby and Owlet?....

Judy 🐰👓 • 🌞 24 years old, proud Navy wife. expecting our first baby in June 💙 👶🏽 IG@gls.xoxo
I'll be co sleeping with baby and I'm wondering if the owlet vitals monitor is necessary? 🤔 
I would like to save money but if I need it then I won't think twice to buy one.  
Also is your baby sleeping alone in a crib or are you co sleeping and using the monitor? I plan to sleep with the baby for 1yr. TIA 👍🏼
Up to what age is the owlet good for?