Hi Michelle, here has been my experience with Clipperz when shared between multiple people. Your mileage may vary, take with a grain of salt, and things may have changed under the hood since I last shared an account with a group :-)
If most people only need to read secure information most of the time, then Clipperz works very well. That is to say, if you don't often make changes to the passwords, then multiple people can easily use the same Clipperz account at the same time.
If your employees will all need to be writing/changing data, though, it gets a bit more tricky. Each Clipperz account has one encrypted set of headers. This is the list that points to the specific detail records. Everything is encrypted, but because there is this one primary/parent record, only one person can save at a time, and after one person saves everyone else must refresh before making and saving their own changes. Forgetting can lead to failed saves (or worse yet, corrupt data, though that's only happened to me once). There are some ways of mitigating this, though:
There's no limit to the number of Clipperz accounts you can have with either (1) the same username or (2) the same password. Because you'll have to share the Clipperz username/password with your employees for them to have access anyway, you can specify a naming scheme that everyone understands. For example, if every client has a number in a management system, your Clipperz usernames might be "mycompany-1" through "mycompany-20" for your 20 vendors, all with the same secure password. That way someone who saves changes to "mycompany-13" won't step on the toes of someone else saving changes to "mycompany-7".
You can also have one account with one person in charge of saving changes, and everyone else uses an offline copy. This has the advantages of providing a very fast offline version, encouraging backups, and making sure more than one person are aware of changes that are occurring.
If any/all of the above sounds too complex or problematic for you, then Clipperz may not be the best option for your group, but I encourage you to try it out! Despite the above, I've personally found Clipperz to be very usable with small groups.
No matter what software you decide to use in the end, remember to keep regular backups, because lost data really stings. Data can be lost by people deleting the wrong record, overwriting a password before it's successfully changed in the remote system, etc, which is a problem that any/all password managers can have.
I hope you enjoy Clipperz as much as I have!
-Jason