I'll just copy paste and edit a bit of what i wrote in the other thread:

I like how, while it awards paying players a fair deal, it also awards players that are online a lot to use their focus. The event also is really fun because you get a lot of instant gratification from beating someone, giving you more rewards etc. The elite guard event felt pretty lackluster on rewards and contained a lot of risk with "what if that guard does not get beaten? I won't get any reward then." This time, however, the only miss you can do is to fail to beat someone, but you are soon given another chance and it will most likely give you another roll at the coliseum gacha, which keeps the fun up.

Some kind of feedback WOULD probably be nice, though. I have no idea how many i have unsuccessfully defended against, meaning i can't attempt to "correct" my deck and see if i can get something better. The event would feel better to me if i could actually actively change my cards when i see that a lot of people are beating me, giving me a chance to counter attack. Of course, the highest winning streak award would probably have to be lowered with that, but it would make the game a bit more dynamic in a sense.

Lastly, the one thing i still dislike with this and the previous event is that you cannot get certain cards without paying. I really feel they should be added to the game somehow, like only being available in the "Guaranteed SR gacha" since that one would be so rarely available to non-paying players. Still prefer the way Aigis does this: Everything is available to everyone, but you either need some mega luck or tons of money to be able to get everything fast, otherwise it will take eons. However those "eons" are still achievable and not permanently innaccessible unless you pay. People can agree or disagree with me that there should be "exclusives" for paying players only, but i still feel there shouldn't be, they should simply be able to get things like half a year faster due to the sheer amount of luck needed to get everything as a freemium player.