I got tired of trying to make my Calypso quieter, and tube rolling got to be a bit of a pain. So I got an SLP-05 and it is everything I ever wanted in a pre-amp.
It's easier to use than the Calypso.
I like the sound better -- more integrated.
Both are fully balanced.
The remote volume seems easier for me to use -- I get the right volume even though it's not so evenly stepped.
The Cary is better built -- heavier at least, and the outboard power supply adds to both weight and the sense of a sturdy item.
Mostly, it's quieter. Both sound great. I didn't find the Aesthetix analytical and I don't find the Cary euphonic. But I do find the Cary to be more....pleasurable. I think less about my system and more about the music. With the Calypso, I was feeling the urge to tweak. Now I'm not.
I later (two years later) went with Cary amps as well. That's how much I like the 05.
I've written a review on this site, and my opinion still stands. The SLP is great and IMO, much better than my prior pre, the Calypso (which is, as it should be for the price, also very good).
If you are in Portland Oregon, let me know and perhaps we can arrange a listen.
Best of luck.
I got NOS tubes from Upscale, and I have a nice power cord.