I currently have acquired over the years, a JCM-900, a JCM-2000 TSL, and a JVM410H. I like them all, but to a large extent, they all crunch the way a Marshall is supposed to. The JCM-900 has a lot of punch, but is rather crude in other respects. The TSL has crazy amounts of low and high end on tap, I think it's an underrated amp. I feel the JVM is a bit on the mellow side, more gain on hand than is ever necessary, honestly I like it the least. Overall, when I want a "Marshall sound", I feel like all of them deliver well enough. I read though, that aside from the JVM, that the 900 and the TSL are some of the least loves Marshalls, which I why I ended up with them, they were cheaper on the used market. The JVM I also scored a good deal on. So I've GAS'd for a while for some of the more notable heads, the JCM-800, JTM54, the Jubilee reissue, or even the JCM 2000 DSL, which is generally more highly regarded than the TSL. So my question is, to me the three heads I already have aren't terribly different. Do you think these more coveted models are so much better, or is it just group think bias that says these amps are so great, and the others so bad? Maybe I'm missing out with my current selection of less celebrated heads, I don't know. Do you have two or more Marshall heads, and really feel like there is a night and day difference?