Esoteric C-02x and the Luxaman c-900u pre-amps - your thoughts

I am looking into these two pre-amps and will toss this question to the Audiogon experts and ask that question ; Your thoughts on these two pre-amps. I am taking consideration into ; the reliability of the piece, strength of the company's distribution here in the US as where would I get it repaired, the best re-sale value of either and last but not least ; the sonic characteristics of these two pre-amps. Thank you and much appreciated.