I have both the Powersupport Air Jacket and the Luvvitt Clearview, and I must say both have their pros and cons.
The air jacket looks the more elegant of the two, the clear hard plastic looking crystal clear. However, it doesn't have a raised rim surrounding the phone, which acts to protect the phone screen from being scratched should one rest the phone face down. It has also a black ring around the opening for flash, which IMO, spoils the look of the clear case. The case is also smooth and can be abit slippery.
The Luvvitt, on the other hand, is a hybrid case. The back is hard plastic but it's sides are made of rubberised material. The back is not as crystal clear than the air jacket, but it doesn't have the black rim around the flash opening. The sides are not slippery and hence easier to grip on. It has, however, a Luvvitt word embossed on one of its side. The rim is raised so that it protects the phone screen when you rest it face down. The clear rubberised sides look prone to turning yellow, but I have not had it long enough to find out. The bottom is also protected.
There you go, both cases have their strength and weakness.