I've listened the last two days, here's my thoughts:
* I like Heller - He's seems quite knowledgeable, takes a strong position on issues, and can back it up.
I see why so many people liked him from his previous stint (seems like he's a "you either like him, or you don't" - kind of guy).
* I like the top 6 at 6 - I prefer to listen to hosts who are knowledgeable and can talk about several sports topics in an hour.
This is one area that I think Heller is a big improvement over Caston; I could turn Caston back on after an hour of listening to something else - and he'd still be talking about the same thing - repeating the same argument from before.
I absolutely hate when a sports talk host spends an entire hour or two beating to death one topic (e.g. the Terrell Owens overdose day was completely unlistenable on ESPN radio - there was nothing else being broadcast that day).
* I like the idea of having a counterpart on the show, to balance Heller - but I'm not sold on the Murphy guy - his voice is a little rough to listen to, I haven't heard him bring a whole lot to the table to add to the show so far - but I'll give him a few more days to prove to me that he belongs on the team.