Well because I now enjoy listening to my 009's so much, I don't really want to be put in a position where I can't, and if anything happened to my BHSE I'd still be able to use the 009's with a KGSSHV while the BHSE was being repaired, also, before listening to my 009's, I prefer to leave my BHSE on power for at least an hour, and having the KGSSHV would allow me to listen to them straight away.
The KGSSHV would also probably make the 009's sound slightly different which will give me a change when I'm wanting.
I don't expect a KGSSHV to make the 009's sound as good as the BHSE, but from what I've been told it still drives the 009's very well.
Lastly, I'm after a SS stats amp, simply because I won't leave my BHSE on power while I'm out, but with the KGSSHV being a SS stats amp I'd be happy to do that.
This will probably be about 2 years before I'll have the spare money for the KGSSHV, so hopefully by then Justin might've started building them.