As a follow-up about Siri crashing the iPad, I figured out why it is happening. The iPhones have apps/widgets that were not included in the iPad such as stocks, weather, etc. If you ask a question about stocks, the Siri server gathers the price and then tries to open the Stocks app, which doesn't exist and it crashes. If you ask about the weather, it tries to open the Weather app. I tried to install the tweak to place those on the iPad but apparently the tweak wasn't meant for the iPad3 as none of them work. So, as long as you keep away from asking questions which would address those apps you would be good. Everything else seems to work well (music control, calendar management, searches, etc.)