70-291 - Transcender or Self-Test

Will be picking up my voucher from getcertify4less.com for the 291 and am pretty confident I'll want to include one of the self-test or transcender packs. I apologize for redundancy as I'm sure this has been asked a million times, but what are your opinions of either for those that have used them?
Comments
The mind is the limit. As long as the mind can envision the fact that you can do something, you can do it, as long as you really believe 100 percent. - Arnold Schwarzenegger
A month later, after much more study and some more time spent with Transcender I was able to pass with a 754 or something like that.
Don't just memorize the questions, but I find it is very helpful to see the little tricks they throw at you. All too often I answer a question confidentally and then I am confused after I get it wrong. But after reading their explanation I'm usually able to see what I missed in the question so that I don't make that same mistake on the real test. I also love their feedback system. You can contest a question and either get an explanation of why you are wrong (which is very helpful) or in rare circumstances they will agree that your point has merit and reword the question.