Hi! I rerolled two weeks ago.
My first plan was to buy the punika PP and it would give me 1 free Punika PP and 2 free Vern PP. This way, I could KT 2 alts all the way to 1302 without doing main quests. leaving me with 4 chars 1302 in no time. The thing is, with the PP issue I could not do it. So I started playing manually like the old times (because I saw no point in playing seriously in EUW anymore, just for gold (valtan, argos, some dungeons)) but ill explain later.)
Currently, I have 1 main 1340 and an alt 1050 which I KT and already got the PPs that will be useful once they work again.
It is really easy to lv up your chars with the honing buffs, the event mats and the daily log in mats, the only bottleneck will be the gold as someone state above, which you need for KT and T3 honning.
Now, keep in mind that the Crystalline aura is account wide, which means that your aura will work in the new region, what I did is bought 1 year worth of BC in EUW to spend it in the aura for the future months, the only benefice I have found so far and this is why I keep trying to generate at least some gold in EUW.
To answer your questions:
Currently I feel more than happy with the change, the AH is a lot better and the people playing the content is a lot too, you can even have luck and get some high Ilvl carrying you in low tiers guardians in the matchmaking which would be impossible in EUW.
I also choose WEI because it has the biggest Spanish community.
The worst part is that you are not going to have all the utility chests, pheons, anmethyst, and potions they gave before that would be the things I miss more, as well as the horizontal content.
Had 880 hrs played at the moment of the change. 2 (weeks ago)