I'm sorry for the usual answer, but Guyot made some very fine guns as well as a range of weapons which have survived less well. Take a look at the St. Etienne thread to get to the right people to ask. I have seen only a superb example that would be the equal of Purdey, et al.
I took a look via the web at the one on offer from Niles. For its age, the gun seems just a bit on the heavy side which could be a good thing. Some of the furnishings suggest a set up for stout loads. That gun is in remarkable shape.
Drake's gun is more typical to my mind with the shorter chambers, etc. Again, great features.
Amazing how low the prices can be on "unpopular" brands.
