I am a musical amature, this is the only rebec I have ever touched, so this review might not be very insightful.
Have played it for a few hours now with some basic tunes. The instrument looks good, plays fairly well, and seems like good value.
There are some items that I will note:
The strings that come with the rebec seem to be a low quality woven gut, the A string is already starting to fray where I bow it. It did come with an extra set of strings.
The bow cannot be adjusted or unstrung, will probably be an issue later on with humidity/heat changes.
The gut strings need to be retuned every few songs.
The bridge was almost flat so that I could not play the middle string, and needed to be shaped before playing.
The pegs are close together and a bit awkward to adjust, they do more smoothly though. (for reference I am a big guy 6'5" with size XL hands)
I live in Canada and cannot find a local source for gut strings, so I recommend buying extra with the instrument.
As a hobby I do 14th century living history, and the instrument looks very close to what is in manuscripts, though not sure if the raised fingerboard existed in my time period.
All the issues noted are things to be expected with a new historically inspired instrument. Anthony was very helpful when I e-mailed in questions, and it shipped ridiculously fast. Overall I am happy with the purchase.