We loved this feature and it works flawlessly for us in April. We had a late-ish flight and when we stepped off the plane and headed for baggage claim, the text with our room number, etc ... came through! I don't think, however, it necessarily gets you a room earlier or more quickly. It's just a convenience, if you know your room isn't ready yet, you can plan accordingly.
ETA, I think this feature really appeals to certain people and might not work for others. I'm not so choosey about room location, etc.... in 40 odd years of travel, I don't think I've ever asked to change rooms. If you are a person who is very particular and knows in advance that you will probably want to at least try for a certain room, then I don't think I'd bother with this feature!