Not very strong at all, unless you have tight pockets and they make the phone hug your leg lol. Sometimes I hear the damn vibration rather than feel it. xD
It's louder than it is strong.

 

Maybe we can hook a electronic shock up to it so we get a little jolt every time it vibrates. lol

 

It is very weak and I hate it

Instead, I just turn my ringer volume down to the lowest audible setting. Then I can still hear it in the office, and it doesn't disturb others.

The only time I put it on vibrate is at the movies or something, where it doesn't matter because I wouldn't be answering it anyway.

 

http://androidforums.com/htc-droid-eris/27447-eris-has-weak-vibrate.html

 

COME ON CADDYMAN!!!! No one has posted in that thread in like 3 days

 

If this was Caddyman's forum, there would only be 3 threads....lol

 

That was the first time I ever did that in a thread. Most of the time I am defending someone who made a dup thread. I just posted that for reference really.