I've been using Simon for just over a month now and I'm very pleased with it, I currently monitor 3 servers with almost 100 pages and it works flawlessly, I tried similar programs (mostly on windows) but none of them worked as solidly as Simon.

I agree with the previous post regarding support, on the couple of occasions I have e-mailed them their response has been excellent even though the problems were my own fault ( I never read the manual)

Apart from a couple of features I would like to see added I cannot find anything bad to say about this program and recommend it to anyone who is looking for a program of this type.