I have them on my RD350 and I like them a lot. Very sporting and easy to handle. Bike leans easily with the rounded profile. If you are looking for sporty handling you will probably like this tire. Obviously heads above CS.
I also have Bridgestone S-11 Spitfires on my CB750F. Also somewhat sporting but one step down from the BT-45.
If you like to ride the twisties, I would suggest the 90/90 front for quicker handling. I have that on my 750.