Fireball makes a lot of people's a arms. I have Jannsenn arms. Fireball. What ever. I had to call fireball for parts for them. Great arms I'd trust them in a heartbeat
If your coming from stock to those, you'll swear there great. The fronts are damn close. I bet a normal weekend warrior type rider won't notice.
The rear may be a little more noticeable.
I personally like the front a little stiffer.
I use what ever is on sale. Type f 10-30 10-40 rotella. I've never noticed a difference in shifting or clutch feel. I also use a new cable, actuator, eccentric, hub, and pressure plate every season or two just to keep my bike feeling 100%.