I've actually played quite a bit on the PBE with the new changes. I wrote some feedback for it on the PBE boards, but I'll try to keep it short here.
Q feels really good with the increased damage / reduced CD + mana cost. I actually find myself maxing it first as support now, and more importantly I enjoy doing it. It's at a point right now where I can decide which ability I want to rank and not lose out regardless of what I pick.
W QoL change helps a lot in any lane you're in. It enables you to have a decent sized shield regardless if you hit any allies, and if that wasn't enough, they made it cast instantly. This makes it feel super fluid to use whether you're trying to save someone else or yourself.
The big change is on E. Initially, I thought it felt really slow (because it is noticeably slower), but after playing a few games you quickly readjust to the new speed. The radius reduction sounds, but it's really not noticeable imo. Even if it is noticeable to some people, it's really not something that will matter when you're landing combos anyways. Its CD and mana cost has been reduced as well which really seem to help a lot with wave clear / control as well as general utility (being able to use it more often without being oom, etc).
Overall, things feel much more consistent to both the player and the enemy while preserving the play style completely. I hate to say it (because I don't normally like change), but I'm honestly looking forward to these changes going live.