Sort of piggy backing on the wisdom of Dave X10.
Reading this forum will jade you because it is primarily messages of "I can't get it to work...haalp!". However the number of problems, complaints, questions, etc (or number of unique threads on this forum) can only represent a very small number of X10 customers, otherwise X10 would have been out of business a decade ago. Admittedly putting up four cameras with Ninja P&T with internet connection for control and observation WILL be a challenge, but my bet is many, many, customers set themselves up and get operational with no problems.
Some conclusions I have after monitoring and contributing to this board for four or five years and using X10 stuff for almost three decades is:
1. X10 instructions are good but not great.
2. Some users don't bother reading the instructions and go to this forum for spoon feeding.
3. There are users who can not successfully put new batteries in a flashlight, yet think they are DIY capable of completely automating their home with computer control, security systems, and remote video surveillance.
Number 1 does not excuse number 2.
So don't let the messages on this forum discorage you. At the same time, I agree with Dave when he says "I think you probably made the right decision".
Good luck with what ever system you get, and come back if you get interested in home automation probably where X10 really shines...but in a tarnished sort of way.