I like that it's easy for people in my office to use as well as our clients who have never used an online reservation software before! Also, they're always updating their website so we can stay up-to-date with all changes/updates.
Nothing at this time but if you don't mind doing some research then there are many other options out there such as LivePerson or even Google Calendar integration which may be more cost effective than having your own CRS server. We were looking for something simple yet powerful when creating reservations for events across multiple locations throughout New York City.