Conrad johnson 2250A VS Mark Levinson 27

I see that there are 3 big names in high end stereo that keep popping up; Mark Levinson, Conrad Johnson, Jeff Rawlings. Can anyone give me a bit of feedback regarding the three and the difference between their products. I realize this is a big question.

You can't go wrong with any of the names above.I got a CJ small tubed amp the MV-55 and is a very nice amp for vocals .I also own the ML 27.5 which is the upgraded 27 and it is one of the best SS amps ever designed.Both amps I mentioned have a cult following.I don't own any Jeff Rowland
amps but I know they are very good amps too.I definetely recommend a 27.5 to build a nice system with.