I've never tested a Sentenal perhaps someone who has will jump in!
As for software HomeSeer has a loyal user base I did test it when I was just using the CM17A but they don't support the Cm15A yet!
There are many users which are satisfied with their X10 setups and Cams.
You Can modify any cam to be a truely night vision cam for 12 dollars (http://www.badacetechshow.com/nvc.htm)
There are many software programs out there do a search on Google and you'll find them.
You can't beat X10s prices and much of the software uses their hardware! ;) :D ;D
I fixed my problem (not for long) by changing my house codes.
If changing House/Unit codes corrects your problems then you may have modules that are defaulting back to the A1 factory default or someone nearby your house (On the same power transformer out on the utility pole) using X10 products also. If a neighbor is using X10 there are whole house signal blockers (The PZZ01) that can be installed on the line coming into the house. It would block incoming signals as well as stopping you from sending out signals.
If you want to do this the ceapest way, find out what neighbor has the setup and start messing his system up. Then get him to buy the PZZ01 found on the X10 Pro site. ;D
(http://www.bdshost.com/X10/lpup.gif)---(http://www.bdshost.com/X10/lpup.gif)---(http://www.bdshost.com/X10/lpup.gif)---(http://www.bdshost.com/X10/lpup.gif)---(http://www.bdshost.com/X10/lpup.gif)----KDR