I like that it's easy for me to book hotels in my own time without having someone else do all of this hard stuff! It makes things so much easier when you're traveling alone or with friends who are busy too but want their accommodation sorted out themselves - no more endless emails back-and-forth about availability etc.
The main thing i dislike atm is not being able to search by price as well as location. For example if there was an option where we could say "I'm looking for something cheap near X" then maybe they would add those locations into searches (as opposed to just showing us what rooms were available). But other than that everything has been great!