12-08-21, 12:00 PM
It's lower down the rev range where you will notice the benefits rather than mid range, the bike is just that bit more capable of running smoothly at low revs and pulling cleanly away. For example if you're out on fast ride and hit a 30 mph limit you can stay in top gear and accelerate back out once you're clear without downshifting. To me it makes the bike more of a capable all rounder, it's happier bimbling smoothly around country lanes at low revs with the other half on the back but if I'm out on my own and the red mist rises the bike is just as capable of getting the the adrenaline flowing.
Unless you regularly use the bike on the track or otherwise abuse it by regularly thrashing it to the red line you probably wouldn't notice any drop off in power which is at the very top end.
If you're in any doubt, an advancer is only a few quid and you could probably sell it on of you don't like it. Either way you still have a great bike so if fitting an advancer seems like too much hassle you're not hugely missing out by leaving things as they are, but given the choice I wouldn't go back to stock timing.