Yeah, I've got a few network cameras kicking around for fun, as well as a wired set of 8 cameras.
The wireless cameras I use primarily just for grins and giggles. To keep an eye on the green house, that sort of thing.
The QSEE set of 8 cameras and DVR is a bit of a different beast. The thing about it is it just 'works' and records anytime it detects movement. It's a simple set it and forget it kind of thing until you need it.
The wireless cameras are a bit more fussy and require having something on your computer running all the time to detect movement, record, etc...
It all depends on what you want to use them for.
Programmer - An organism that turns coffee into software.
If all your friends are exactly like you, What an un-interesting life it must be.
"A door is what a dog is perpetually on the wrong side of" Ogden Nash