Is iMessage missing something?
Seems to me that the perfect messaging app would be one that does all that the group ones do but also do it via SMS texting. Not everyone has an iPhone/Android/Smart/Feature phone. I believe the SMS market (no stats to prove this) is MUCH bigger and fail to see why no app also does SMS as well. Wait... one does. But it's on Windows Phone Mango. And they also have speak to text.