Thanks Linzi that is really reassuring that it works well on different mattresses. I thought it was strange that it wouldn't as would have thought it would say something on the packaging of angelcare monitor.
You have also answered another question for me, I had heard that the monitor only worked with the mat being used, so glad to know it can be used with just sound when bubs gets bigger and wiser and starts cheating!!
Just one more question, if you know: I am considering getting a mattress topper for the cot (to make it easier for when bubs has little accidents) and wondered would you put the mat under the topper and the mattress or just under the topper??