Book Like a Boss is one of the best deals I ever bought - don't miss this. I upgraded my old account and stacked 2 new codes for another project. I use it from the previous deal and was excited to see it again. Setup is really easy and connects all your calendars to BLAB. Integration in your website is also easy and allows choosing your own colors - it even replaced my contact form.
The german translation got much better in the last months - if it's not working in your language, just send in your recommendations and the Team will be happy to improve the translations together with you.
If you plan to use Book Like a Boss you should definitely think about stacking 2 Codes to get all features of this deal.