Glad to see this is out, it looks nice. If you look at Federico's review/interview [1] you can find clips of the voice enhancer and gap shortener, they sound quite good. I know a few people who will probably jump on this.
I fight with the Podcasts app (and podcasts in iTunes) on a weekly basis. I would love to replace it with something by a developer with a good track record like Marco, but I do about 80% of my podcast listening on my Mac and I don't think the annoyance factor is high enough for me to switch to using only my iPhone yet.
At the end of Federico's interview Marco says he's considering an iPad or maybe Mac app in the future, I can only hope.