[Amadave]

I am looking to add tube amp/preamp to my system. One of the brands I am considering is Balanced Audio Technology. I have heard their products playing through my speakers and very much enjoyed it. I heard the 55SE amp and the 33SE preamp. Recently BAT released the 56 series of amps. In the market, I can acquire the 55SE and the standard model 56 for about the same money. The 56SE is quite bit more. My question concerns the differences between standard and SE models. On one hand, I would I would like the latest and greatest, but if the SE package is a significant upgrade, I might would go with the discontinued SE version. Has anyone a comparison of standard vs SE? If so, is the difference worth it?