They've only just fixed this? They took their sweet time over that one.
A couple of years ago I ditched (well, gave to the missus) my iphone 4 for an android phone. Thankfully I had long ago turned iMessage off, on the grounds that it was shit. Back then, at least, it would spend about an hour trying to send a message as an iMessage before giving up and sending it as a text message. SMS is and should be basically instant. Maybe if you have limited SMSs on your contract/PAYG iMessage would be tempting, but considering how much a contract on an iphone is already, a huge bundle of SMSs is practically nothing on top. I bet it wouldn't be hard, if not already done, to forward any SMSs to your other apple devices as an iMessage, if that's what you want.
And yet despite all this, every now and then, I'm actually tempted by the iPhone 6. I went to look at one in an Apple store and it was very nice. They have finally made it rounded again, so it would no longer cut holes in all my trouser pockets. I can't see Steve Jobs letting them get away with a sticky out camera, though, that's far from perfect. Maybe the iPhone 6s ...