Harvin didn't hold back, either, when talking about the effects Favre is having on his learning curve.
"It's great, and not only the reps but just practicing with him," Harvin said.
"He's taught me more than any coach taught me just in the short period of time that he's been here. Actually being out there and getting reps with him and talking about things at practice, but to come out here and get some of the things that we talked about, and get it down, it was good."
High praise, indeed, as the Vikings begin to realize some of the intangible benefits of the Favre signing.
In return, Favre sees Harvin's talents and doesn't mind offering a mentoring shoulder in the rookie's first year, but Favre also said he believes in keeping things simple, even after 18 years in the NFL.
Harvin is an exciting playmaker with the ball in his hands, whether he is returning kickoffs, executing the Wildcat or catching passes, but he has been called for illegal shifts while being asked to serve many roles for the Vikings. So how much will Favre look to mentor him?
"As much as needed. We all make mistakes," Favre said. "He's got football knowledge. I think that's something you're born with; you can't coach it. You really can't coach speed and quickness and things like that."
But a little old-school player mentoring rarely hurts, and Favre isn't the only former Green Bay Packer helping out Harvin. Favre said Harvin was also working with Antonio Freeman earlier this summer. The quarterback believes that, too, should help the rookie.
"To me, (Freeman) was a perfect example – I don't want to say he was an overachiever, but he didn't have the talent that Percy has – but yet we all know how productive he was," Favre said. "He had great football knowledge. Percy, I see that in him. He has a feel for certain things."
Of course, all of this talk of mentoring after signing only 15 days ago might lead some to believe that Favre doesn't have much left to learn on his own. He indicated that is far from the truth.
While the playmakers surrounding the 39-year-old quarterback are intriguing, he knows they will look even better with a passer that is instinctive in the system. Favre isn't there yet.
"There's a lot of playmakers. How we use them and how I fit into the mix, just without looking at the film, I know there's some plays I can make. Just a trust standpoint with these guys that I probably didn't attempt," Favre said. "… There's a lot of weapons. I think we can be very productive, but not if we make the mistakes we did (Monday) night. We left a lot of points … a lot of yardage and opportunities on the field."
And, yet, the Vikings were still the better team with a recently signed old-time gunslinger and a saddle bag packing a young bullet like Harvin.
Houston's four sacks were a preseason high for the team.
Tim Yotter is the publisher of Viking Update. Follow Viking Update on Twitter and discuss this story on our subscriber message board.