I was a Google Password user but have since switched to 1Password.
Is Google Password convenient? Absolutely. If you use Chrome on your PC, your phone, and your tablet, all your passwords are stored and they work on all your devices.
Is Google Password secure? Yeah, mostly.
Convenience: If you set Google Passwords up so that it automatically signs you in whenever you are signed into your Google account (which is almost all the time, right?) your password manager is ready and works seamlessly.
Secure: Whenever you are signed into your Google account (which is almost all the time, right?) anyone can log into any website with a stored password in Google Passwords. They just go to the website log in page and Google Passwords fills in the credentials. Your computer doesn't know who is at the keyboard.
Also, anyone can click on the 3 vertical dots in the upper right hand corner of screen, click on Password Manager and if they know or can guess your PIN can see all of you passwords. They could even export all your passwords through the Settings options. If they know or can guess your PIN.
Good password managers have a timer on the password manager being active, ie. if there is no activity at the keyboard or mouse for 10 minutes (or 30 minutes, or an hour, etc.) the password manager turns off. This means that if someone tries to login to a website after the timer has shut off the password manager they won't be able to login to web sites.
Ultimately you will have to decide how critical your PC security is to you. If it's just you at home using it, Google Passwords is probably OK. You and a spouse or significant other, probably OK. But if there are people around you that you don't want to have access to your sensitive websites, I'd get a real password manager.