I purchased the 1400 as a replacement for an old 800.  Improvements over the old 800: two person memory, improved lighting, more comfortable seating, deodorizing and sanitizing features, and steel sprayers instead of plastic.  

Installation was simple, under an hour including cleaning.  Make sure you use silicone tape and a channellock to gently tighten fittings if "hand tight" isn't tight enough.

When ordering, order a water filter at the same time, you'll want to protect the bidet's internal components.