Do any mobile application developers on the Java, Flash Lite, Blackberry, Windows Mobile, Symbian, or Palm platforms have experience using this site to distribute and test beta versions of your application? If so, what type of experience have you had with this site, and have you paid for premium spots or used their Pay Per Download program? How valuable is the beta testing community, and is the feedback they offer any good?

Are there any other mobile app distribution sites you would recommend, that have either similar or superior download rates to GetJar?

Thanks a lot, I've been digging but haven't been able to find too much information about this topic.