Bought the plugin along with Booking Manager a few days ago for a client install, had a few issues with custom fields.
Emailed for support, and got a response back in less than 12 hours, and had a solution to the issues along with a code fix with another few hours.
Very happy with the plugin, and super happy with the level of service.
Anyone considering this plugin, I highly recommend it. As well as being about the best I could find for the purpose, the support is excellent.