This is a great project. It takes a bit to wrap around all the parts but it works very well. The serial hardware works great.
This is a vastly overrated project. Designed in the early nineties, almost all vital parts suffer from fundamentally bad design. (Just as example: Sending a raw signal with "arbitrary" intro sequence and another sequence as repeat sequence is something Lirc cannot do.) I severely doubt that someone today (original developers are no longer active) understands the core code. Much has happened to out understanding of IR signals since the early nineties, but the legacy code of Lirc remains the same.
There are no 4 star reviews.