Hi Andy.The XB12scg and the 1125 models are completely different characters despite looking to have all the same cycle parts.
The 1125 engines seem to rev on and on, whereas the 1200s run out of steam quite early. Totally different yet both great fun. I have a 2010 model year 1125CR bought at the demise of Buell in Nov 2009. Also own 2 tube frame Buells and a 990KTM. The 1125 engine is by far the best. Have just done a ~480mile round trip run up to East Kirkby at the weekend, a surprisingly competent distance bike, (if you have decent neck muscles) With a decent pipe (Albert/APH ) it howls rather than booms like the 1200s. I even had a car driver comment on how nice it sounded at a service station having overtaken him earlier.
Later (post 2008) 1125s will need the charging system rotor modification. Mine was done at 10k miles and the clutch slave cylinder another know issue at 3k miles. Oberon do a upgrade for the clutch though I am still running the Buell one. The rotor mod is available from EBR or Twin Motorcycles in Holland. Both have been as good ever since currently at about 17k miles. All fuel in frame Buells seem to like regular wheel bearing changes and are appreciative of more owner attention than a Honda. Attention from the general public is a given.
Good luck with your quest.