I just got the pillow for a buy out review. It opened lots of new doors for us sexually. We love it. It's also great if you have limited storage space because all you'd have to do is deflate it. Wedges are bigger and harder to hide.
Well since I'm on a tight budget, I would definitely give the inflatable one a try. But I would worry about it getting a leak after a while. If you have the money to invest in a Liberator or some other wedge pillow, that would be the wiser choice.