Sure, my pleasure. The unit that I have is this:
From what I understand, the installation can be DIY, but, well - not for people like me. The only maintenance that really needs to be done on it is to replace the $50 canister once yearly. Probably the biggest caveat is the fact that there needs to be a water line nearby - though, most utility rooms have a water line, apparently it's a little money to have a plumber do the hookup.
I'm really happy with the humidifier. Like I said, it definitely beats filling up reservoirs, manually adjusting the humidity constantly, cleaning out sediment, etc. It's really "fire and forget," for the most part.
Hope this helps!
I checked the specs of that unit and it says:
> Water Capacity (Gallons Per Day): 11.5 to 34.6
So you're not going to be saving any water vs. existing system
The best thing I've found for hard water areas around here is this http://www.amazon.com/Aprilaire-800-Residential-Steam-Humidifier/dp/B005DS4YY2
It's Expensive, but it's designed for hard water areas and very easy to service. I've installed a few of them and have heard nothing but good things.