For everyone wanting push, the Sparrow team is asking that you sign a petition
here to Apple to allow them to use the VoIP API.
Yeah, I am sure "the petition" will make Apple change their policy </sarcasm>.
They don't even allow IM apps to utilize VoIP API.. there is a fat chance they are going to make exceptions for e-mail clients!
Sparrow team really needs to stop whining about this, and start thinking of how to make push work within the constraints of Apple policies. Sure, maintaining servers for Push takes up resources, which adds costs. However, Sparrow could simply make Push an optional $4.99 in-app purchase, for those who must have it. I would be all over that.
I suppose for now since you can't remove the default mail app anyways why not just keep it on for notifications and then open sparrow. Thats works a lot easier then configuring with boxcar.
I agree, Boxcar thing is a terrible kludge.. The problem with keeping native notifications is that you don't have any way to get badge counters.. So if you're away from your phone and missed a Notification Center banner - you have no way of knowing you have new email.. Far from ideal.