It could have just been a fluke.. I am sure there are a lot of people that use those programs and have no issues.. Don't let one opinion keep you from trying them.
I found that program a while ago, but at the time it didn't support 10.4.8, so I didn't get a chance to check it out. Though admittedly, I still don't know whether it supports 10.4.8/10.4.9
The combination of Sleepless and InsominaX didn't work for my Macbook. (I also tried them individually and that didn't work either) But I am using an external keyboard and monitor with a wireless mouse. I think the external monitor helped keeping the Macbook awake.
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