We have the Angel Care with sensor mat. Its great. Actually we have two, the older model for our two year old (just so we can hear she is awake when we're downstairs) and the newer model for our 4 month old.
The older one has a temperature display on the baby monitor, along with the setting for choosing just sound, sound and movement, just movement etc.
The new one just has a light and an on/ off switch on the baby unit. This is better because what use is a baby unit with a temperature display? Your baby can't read it
We sit downstairs and control everything from there, max temp and min temp alarms, movement sensor on and off, the temperature display, all sorts of features.
As for false alarms, these will generally happen as soon as a baby goes from a moses basket to a crib or cot and start to wriggle around in the night. The first couple of times it happened we panicked but all our little girl did was to go from the bottom of her cot to the top and was sound asleep.
We tried another monitor for our second baby, a BT one I think. I have to say the Angel Care monitors are brilliant and the quality is good too. The latest one has a rechargable parent unit that cen be sat in its cradle or taken out and carried around.
Hope this helps.
Stu