From the appropriate document: (this may have been presented previously)
Max roll rate in Normal Law: 15 degrees/second
Max roll rate in Roll Direct: approximately 20-25 degrees/second (varies with speed and config, but this figure IS MAX)
If you feel this is 'twitchy', be careful (and smooth).
I could get a roll rate of about 60 degrees/second out of a 727 with partial spoiler deployment (increased spoiler roll differential)
That's minimally 'twitchy'.
Max roll rate for a T-38: 720 degrees/second
That's 'TWITCHY'.