I have just been setting one of these up for a customer, and felt the urge to post as I am really impressed.
I am not a fan of windows but we keep a PC just for jobs like this and the ProAIS software that is supplied as part of the package installed easily enough and works very well, giving control of every aspect of the unit as well as showing GPS and AIS status in a clean way.
The unit itself is really well designed and built, with easy connections. My one quibble would be the lack of PL259 for the VHF antenna connection, we always advise people to go for a second dedicated antenna since this then provides an emergency backup for the radio if needed; so the connector should either the a standard one or an adapter should be included.
Everything else needed for the installation is included. The GPS antenna is super-small and worked fine indoors! It is small enough to lose in a cup of tea.
For less than 500 quid (with a 2nd VHF antenna included) this is a great way to add both AIS receive and transmit you your RIB.