Ridewithstyles I used to have an XSR700 before my CB1100 and that was a lot of fun on the a and b roads although liable to have a negative effect on my license. The faults with it were it was too light for high speed so felt a bit sketchy over say 80 mph and at a ton it was pretty hair raising. It was also a bugger to work on, just getting to the spark plugs was a major operation. You also needed a rear end of concrete to travel more than 1 1/2 hours on it. If they had stuck that engine or a slightly bigger one in a more retro classic design it would have been great. The XSR 900 could have been a great bike but again they didn't go retro enough.
My big inline 4 doesn't need 'winding up' as it redlines at 8500. There is a good amount of torque low down and it starts to take off at around 5000. Apart from the weight ,252 KG, it's the £750 service involving valve clearances that gets my goat, and that's just to check them.
The attraction of the Speedtwin is, similar power, lots of torque, lighter (but not too light), a narrower motorcycle, good on fuel economy and importantly, easier to work on. I assume it should be as much fun as the XSR 700 was but with a more stable platform at higher speeds. Comfort is a bit of a worry with the thin seat it has but nearer the decision time I will have to try to get a test ride on one. Downside is the price Also I'm not sure if it will be as reliable as a jap, especially a Honda.