I like that you can see all of my hotels in one place, which is great for me because it makes things easier when searching! It's also very easy-to use once set up correctly with good information about each property from TripAdvisor or other sites such as Expedia etc..
Sometimes there are issues where data isn't updated quickly enough so sometimes properties show inaccurate prices but this seems rare now compared ot before we started using them? They do charge per search at first however they offer free searches if needed (for example after checking out their website). We have been able t o find our accommodation much quicker than previously by just typing into Google what type/class /price range i am looking too - saving time & money both ways!!