Wemfan, the "Manley Reference" line was VTL's "premium" line while the designer David Manley was still owner of the company. When Manley terminated his affiliation with the company, his son Luke Manley took over the co., and EveAnna Manley developed the Manley line as a separate co. I think I got the history right.
I have owned a pair of Manley Reference 200/100 mono's for many years and can tell you that they are great amps; if you like tubes. Powerful (200w in tetrode mode) reliable, dimensional and full-sounding amps with good bass and that natural midrange quality that only a tube amp gives; IMO. Not as squeaky clean sounding as great solid state amps, but......
I have owned a pair of Manley Reference 200/100 mono's for many years and can tell you that they are great amps; if you like tubes. Powerful (200w in tetrode mode) reliable, dimensional and full-sounding amps with good bass and that natural midrange quality that only a tube amp gives; IMO. Not as squeaky clean sounding as great solid state amps, but......