Anyone use Joomla with an appointment booking module?

[JWilliams.RadiantDetail]

I was Googling appointment booking web sites, found some really nice looking ones. But I don't really want to shell out $$$ every month. Joomla has some paid modules, but I can't find much info or hardly any reviews of any of them. I don't mind plopping down $100 one time, but not on something I can't test out, or at least talk to someone who uses it and can comment on how well it works. Don't need anything fancy, multiple employees (2) and integration with Google Calendar's about it.