I just found this out today, while doing some of the new dailys. Apparently changing boots during the duration of the rocket boots extreme speed buff removes it. So if you use the boots and wait until a millisecond before the buff wears off and swap boots you can effectively not receive dmg from it
This is useful to myself as a rogue especially because I can activate the boots then stealth and just change my boots before the buff wears off and not be taken out of stealth. 300% stealthed speed for 4 seconds is pimp for getting a cheapshot off on that flagrunner up ahead in wsg
Just as a sidenote, if you use the boots FROM stealth, it removes the stealth buff from you!(For all those who dont already know.)
As you can see from the screenshot combat log, i gained the buff, then gained stealth, then lost the buff and took no damage (Note: I have a small deficit in my hp in the screenie just from the stam difference of my regular boots and the rocket boots.)
Hopefully some of you guys will enjoy this little tip, I figured it was time to stop being a leecher!
edit: i spel gud!
and p.s.- I'd make a video but my graphics card doesnt get along with fraps :<