First Sound preamps....feedback please.

I am considering this preamp as a possible next purchase. This pre would replace my current BAT vk-50se which I have had for about 15 months.

I heard the Deluxe model at a dealer once and was amazed at the sound his system produced. But I was also unfamiliar with the other components I was hearing .

I am looking for a preamp, preferably balanced that can be powerful and full when called upon and also produce very fine detail and nuance with ease.

Personal reviews are really what I am looking for.

Thanks.