Pros and cons with table lock

I use an ole db destination which I simply use to insert data into database.
If it's configured to use Fast Load as access mode, then it is possible to switch on/off the Lock table property, which is set to true as default.

Are there any drawbacks with switching off the Lock table property? What do I gain when using it?

Thanks for your help!

Its a performance issue. Having a table lock means that the load process doesn't have to worry about lower level locks, and so the load should be quicker.
But it does mean no one else can use that table