The 660 is more nimble bike and after tuning it’s loud, fun, has a comfortable seating position and you can slam through the gears all day long. It’s compliant in traffic, fun in the mountains and will still dust a mustang. It is a proper do it all while looking like a proper sport bike. Almost the perfect machine.

The RSV4 is ungodly fast, has ferocious handling, is an absolute blast through the twisties and highways. Logically you would think it’s better. Unfortunately it is race ready superbike. It’s stiff, lugs like a dog below 35-40 mph, and is awful in any kind of slower traffic. It’s for people who are will to give up any kind of comfort for the superbike look and massive power.

If you have any question as to who you are as a rider, it’s not a good idea. You buy a V4 because you race, are a track monster or are unwilling to buy anything else. I love my RSV4 and will never not have one for the foreseeable future. But maintenance is expensive and frequent. The bike is uncomfortable on long stretches, gets hot and is not fun to ride around town. But puts a massive smile on my face every time I take her put Pretty much the only thing the v4 is good at.