It doesn't "choke" when you need it most. You're just perceiving the normal performance as being less than optimal when you become stressed and want things to work faster. It's a psychological thang.
OMG I love this guy !
Exactly what I would have said
In general, it's an unreliable piece of ****.
wow, for someone who replaced the phone 30x times you would think you love the device
The iPhone OS, isn't always as responsive as I would like, but its still the best mobile OS currently available ( haven't tested the PRE)