Spectral amp/preamp


I know Spectral wants users to mate their products together, but I was wondering if anyone has used a different brand preamp with a Spectral amp or vice versa and what they thought.
runner
Now c'mon ebm. It may not be your taste, but garbage? I have heard a Spectral set up several times at a now closed audio store in Philly, and it wasn't my thing either, but it isn't garbage.
There are many brands of amps/preamps that are as good as and better than the Spectral. Why would you want to limit yourself to just one brand.
I do think that it's very expensive for what it is. It's funny, if you read their blurb about haw fast the amps are etc., it is pretty impressive; and they certainly look good, but in the end, it always comes down to how it sounds.