The B-Legit has more of a mainstream feel to it then his previous albums. It seemed to be a lot like the new E-40 album to me. A lot of mainstream type beats, but still had some tight ass songs on it.
The Messy Marv and I-Rocc had some bangin tracks on it. I gave it a 5/5 at first, but it seems like lately it has fallen out of my rotation. Still has some coo songs on it though.
The Kay-9ine really impressed me. It had some coo production on it and some hardcore raps to go along with it. It was a little rough around the edges, but I think it's worth enough to buy.
I'd say pick up either the B-Legit or the Kay-9ine and leave the Messy and I-Rocc album out. If I could only buy one I would get the B-Legit.
Late!