On the iPad, if by rumble you mean some sort of audible feedback when you touch a key, you can turn that on and off in settings:general:sounds: keyboard clicks.
I like iPad Safari for viewing the forums. On my Blackberry it is definitely a last resort. The screen is just to tiny for me and the controls to zoom in and out are too much work now that I've had a taste of the Apple mobile browser. My next phone will probably be an iPhone.