This is copied from the basic's user manual:
IMPORTANT: This device uses a software based clock. Instead of a hardware based clock chip this
devices uses a software based clock. This works the same as most alarm clocks by counting the pulses on your
households electrical line which is regulated by your power company. In most cases this provides a very stable
method of keeping time. However, when power is disconnected the thermostat will not continue to keep track
of time. On power up the device reverts to the Day Temp and the Nite Cycle options are disabled until the
system clock is set. This method allows the Herpstat 1 Basic cost to remain low while still providing some
additional advanced features which would not be otherwise possible.
So, yes there is a night drop function. But if you have a middle of the night power outage, it will revert to daytime temps until the system clock is reset properly.
IMO I would go with the Herpstat 1 Basic over the VE any day. I'm swiftly becoming a Herpstat fangirl.
Edit: Yes, actually, I agree 100% with Aaron. I derped and completely forgot about the relay being in the intro+ now
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