Yes, its a very nice upgrade... Ive ridden all flavors many-many times.......................... There is a huge "But"..
It 100% depends on what YOUR expectations are..... How you ride, where you ride, what you're actually wanting / looking for.... For some people, this conversation is very simple, they are a 'normal' average person................ other people are looking for VERY specific aspects that the stock ES might, or might not provide.........
Here is only one example, I have known several people that like to off road their bike, the stock ES is TOO SOFT even in the hard setting.... they thought the ES would provide them "all" the range they need.............. Not true..... they had to go back and change the springs, oil weight and volume to help take care of this situation....... With this work done, Ive had conversations with them now after this work and they claim the lower settings now on the ES are NOT the same (obviously).... They now DONT have that wide window of adjustment they did as when the bike was stock)............. SO, very difficult to "have it all"........
Depending on what you want.......... It might be the right choice.............. OR NOT.... ?????? Maybe only you can decide that choice. I suggest test riding a ES..... renting one for the day....... or borrowing a friends ES, so you can really see if it's the change you think it might be for you..............
The folks off the internet will probably tell you it's GREAT............. do they ride like you? Do they ride where you ride? Do they do the same thing as you ? Take this into consideration.......
The Yamaha ES suspension is pretty good considering....... It's not perfect for all situations or all riders.........
Of course...... this is IMOP -