I've ordered an EZP after some research. I haven't received it yet, but I call tell you how I made my decision. Freetom and Peecock I've read are hit/miss as stps, and Ecprosthetics I read starts tearing/wearing out quickly. I don't do cyberskin, so I didn't go with the the mr. limpy varieties. For what it's worth I have used a medicine spoon at home, and have had mixed results, so I shy away from getting a stp that has a medicine spoon/nipple setup. I was looking for something that packed well and would not have too much of a learning curve as a stp. I'm also happy it doesn't require a harness or jockstrap to keep it in place.
Emsil is also releasing a stp soon that I think is worth looking into.