I have an AM7 multiscale and love it.

Mahogany body and neck, ebony board, plain maple top. I like the lithiums a lot but I think the wood choices play a huge role, as well as tuning (drop A) and material (hi gain rock/metal). The lithiums have a lot of attack and are tight tight. I think they have some kind of built in boost which usually means I'll turn off my OD boost even for hi gain stuff. Sounds good for me and the above, but if I was going 6 string E rock I may choose something else.
I may get a AM6 for dropC or dropB. I really dig the neck on the 7 and can shred up a storm on it, maybe more so than any other axe.
One thing to note- some receive a guitar where the hipshot bridge pieces need to be unusually high to get a decent setup. Not sure if that is a design flaw or setup incompetance- mine are up a bit, but nothing extreme or bothersome and I like a bit of medium high action. It arrived this way and it works really well for me.
Others report they need to max out the height which becomes very weird and feels awful on the right hand. Kiesel probably could use a bridge piece that is a little thicker to avoid such issues. If you like ultra low action this likely won't be an issue, and it may not be an issue anyway- but worth mentioning as others have reported.
Here is one link
http://www.kieselguitarsbbs.com/viewtopic.php?t=47332