I haven't much quality problems with X10. The X0 technology isn't perfect, but it's a heck of a lot of fun (I think you'll agree).
There are pricer similar products out there. But the cheaper the price... the more I can do. I know it all adds up to a hefty chunk of change sooner or later (generally sooner). But it's a few bucks here and couple dollars there.
And next thing you know... we have a home of the future. Of course the future only works reliably about 95% of the time, but what the heck, it's still impressive.