The rating I wanted to give was 4 stars, but they should be rewarded for their excellent support and helpfulness. The plugin is very reliable, and does not affect the performance on the site too much. Easy to set up, there are small improvements to be made but all in all I think it is the only viable solution at the moment for a truly complete wordpress booking system. Initially I was a bit skeptical since you have to buy addons to use many of the functions, but you just need to know a little bit of programming to understand that there is really a lot of work behind this product and it is worth all the money spent down to the last cent. I hope they only find a solution to receive emails in the language in which you fill out the form, for the rest is great.
Congratulations, great work.