Anyone heard the Canary audio C-1600 Preamp??

Hi- Looking for a preamp to mate with my Purity Audio 300b mono amps- looking at around $4K used- Very interested in the Canary but cannot find any reviews or feedback on it- has anyone heard the C1600??
Also looking at the Concert Fidelity LSXv2 and the Viva Linea( for more money)
Any feedback on these would be appreciated- thks