Hi Dave,
thought I’d add my perspective having had a C14 for three years and 100k and a GL1800 the last three.
Lane filtering is legal in Oz and where the lanes are more generous filtering on the GL hasn’t been a problem. I do realise from my limited rides in the states that the lanes are narrower there and theres the legal issues in some states.
I’ve had at least 5k riding FJRs, owned the C14 and have had a couple of good rides on the ST1300. The C14 is the sportiest feeling of the three. Note ‘sportiest feeling’ rather than ‘sporty’. The Engine is more aggressive and the steering sharper than the FJR, but a well ridden FJR would not be left behind. Also the FJR is better at the low speed stuff. I preferred the all round raw and sporty feel of the C14 and when it’s on the pipe it’s pretty addictive. However the long term seating position isn’t as good as the FJR and it was more of an effort for my wife to get on board, even after I had the seat customised.
the revelation out of the three Jappers is the ST. Less visually appealing than the other two ( to my eye) and more of a stodgy reputation, at least in Oz. But when you actually ride one, it handles sporty riding just as well as the other two, is only just trailing in the motor output stakes, the pillion seat is more accessible and is better at eating miles than either of them. I think it’s a better all round bike. A friend of mine, also an IBA rider has put a few dollars into modifying the screen seat and updating the suspension and the bike responded brilliantly. He got better results updating the suspension on the ST than I did with the same tech on my C14.
the only thing I find unpalatable on the ST is that Honda accord dash, but that’s just my opinion! The other thing of course is that the STs have been out of production for longer so are therefore older. If you are considering Japper sports tourers, the ST is worth consideration.