Yeah, I'm pretty sure that's a Gangsta Grillz tape.
I didn't think it was very good, as Yelawolf doesn't fit the traditional mixtape format (to me anyway) and it was before he really found himself. There's some good stuff on there, it shows some of that early potential, but it's not something I would listen to. Creekwater was better to me, but that's more because of the potential shown, not the actual quality. Good stuff, just a little too rough around the edges.
Pissin' in a Barrel of Beez isn't talked about much because it's not that great, it isn't incredibly rare though. I would say that the reason it started getting more exposure over the last couple years is because that's when Yelawolf really started to garner a fanbase past the underground. 2011 was a great year for Yelawolf that just didn't end as well as it should have.
Ball of Flames: The Ballad of Slick E. Bobby was a little better, but suffered from some of the same problems in my opinion.