I have not found a component as well supported as this before. This system is full of features, more than most users will need, but at the same time is simple to use. Should you have any problems all you need to do is submit a ticket, you will then receive a very fast response from the developer, with the solution.
Jomres is constantly evolving with new suggestions from users being incorporated all the time, it is unreal how much time the developer spends on this. The attention to detail is amazing. This is a system that can be simply altered in looks to fit any site, and with just a few settings changes can be used to either support sites from: A small simple campsite all the way to multiple large resorts. Invoicing; detailed availability calendars; e-mail confirmation, multi tiered management........ I dont know where to stop.
If you are interested in trying it give the free trial an audition. I would be very surprised if you dont like it, and even more surprised if it can't cover all your needs.