Futari wa Pretty Cure has an amazing dub. Nearly no flaws. The voices are superior to the Japanese in every way possible.
The only things they changed was the language, (Obviously) the names, took out the "-mepo", but that would make sense if they did that because "I am very happy-mepo!" would make NO SENSE in English! They took out the eyecuts, but that does not bother me much. This is NOT 4Kids who dubbed it. That's all they changed.
My お気に入り voices:
Rocio Baranona was the BEST at Cure Black. Yoko Honna was OK, but she would never beat Rocio at Cure Black.
And Roger Rhodes, words cannot explain how awesome (and funny) his voice for Mepple is. It's just....DFHOIGHDFHOHGDFSOI so awesome! It beats Tomokazu Seki any day!
Angie Beers was awesome too! She voiced Mipple. I don't think I can imagine Mipple voiced によって anyone but her! Not even Akiko Yajima! Angie Beers is the only person who's best fit for Mipple. No buts.
If あなた watched the dub, but think it sucks, I'll respect your opinion! But to me, it's one of the best dubs I've ever heard.
Here's a link to the dub since あなた won't find it anywhere else!
link TL;DR: The dub is awesome! Watch it in the dub!