I have owned both the 1100
and 1300
The following is my opinions on the bikes.
Power: The 1300 is more powerful then the 1100 but is touchier on the throttle, the 1100 is smoother and higher geared resulting with lower rpm at higher speed.
Seating: The seat on the 1100 does have more range of movement, you can slide around more as the seat is longer making it quite comfortable.
The 1300 seat has three height settings which is a nice feature although it has a slightly forward sloping angle leaning you towards the tank, I found this to be a pain but there is a trick to level it out thereby rectifying the issue.
Fix: Put the seat up into the second or third height setting, lift the rear of the seat and push forward a little, drop the rear locater pins into the slots of the lower setting thus making the seat flat, I have found this to make the seat as comfortable as the 1100. Or just go for an aftermarket seat.
Handling: The 1100 feels like a bigger bike it has solid handling, is predictable, easy to manage and sure footed, able to handle pretty much anything thrown at it. The 1300 is just as good but feels lighter and smaller, it is easier to throw around and feels sportier. (The first corner I took on the 1300 I almost dropped it on its side, it just was so easy and eager to lean, a bit of acceleration fixed this and the side of the bike stayed off the road.)
Speed wobble: I haven’t experienced this at all on my 1300 but I know it happens, although it is rare. This is non existent on the 1100.
Size: Both bikes are big in size but easy to lane filter/split and as the bloke in the vid said if the mirrors will fit the bike will.
Panniers: The storage on both bikes is awesome. The 1300 has lots of storage space but 1100 was better, the shape of the panniers on the 1100 makes it much easier to pack.
Electrical things: The 1100 (the one I had anyway) has a weak alternator, this can be replaced but is very hard to find. The 1300 has allsorts of electrical gismos, the headlight height adjuster is electric (not much of a difference but nice) lots of info on the digital display (kilometres per litre, air temp ect) but the big bonus is the electric windshield, if it is cold or raining or if there is lots of bugs/dust put it up and it provides amazing protection, put it down and get a nice amount of airflow or put it anywhere in between anytime you feel like it.
Heat: I found the 1100 put out a bit of heat but not much. The 1300 puts out a lot of heat, there is lots of things that can be done to fix this but I just haven’t had the time/money to do this yet. That all being said the heat the 1300 can put out isn’t unmanageable it can just be a bit uncomfortable. When ridden non stop for hours on end it will become fairly hot but stopping for a break now and then for a few minutes will cool it down a lot.
Age: The 1100 I had was a 1990 model and offcourse things were going to start needing fixing/replacing (electrics ect). I thought it would be a good idea to upgrade to a newer ST before this happened. I took the 1300 for a test ride when I was looking at a new helmet and I really liked it, even more then the 1100 so I got it.
Both bikes are awesome machines and I would recommend either of them to anyone.
This is just what I have found with the two STs I have owned, others may have had different experiences with theirs and I hope they will post what they have experienced.
Cheers
Shiney