I only have had a Mophie for my 3GS and it was ok. Bulky, a bit too shiny and slippery but did a pretty good job for what I wanted. A case and a charger in one. Now I've got the 4S and I'm going to need a new case/charger. I'm kind of leaning towards the Boost Case because I think it looks slightly better and it supposedly increases reception too. Not sure about that though. And the Mophie Juice Pack Plus looks very solid too. Anyone here have any opinions on either of these?