The Rainbow Dressbloom is the only reason why I'm remotely considering this gacha.
I don't think the deal as a whole is exceptionally good, especially not since I mostly already have all the girls I want, so I'd end up with mostly dupes, which would only translate into a fifty percent increase to my stack of bond crystals.
For players who don't have many Rainbow girls yet, it's a decent deal I guess. For players who are mostly after specific 6* girls, there have been better deals (and I'm not even counting the Black Friday one). So it's an okay deal, but not really exceptional.