I have owned VTL MB-750s since approximately 1995. I loved them then and I love them now. They are transparent, extended at the frequency extremes and amazing in the midrange (not traditionally "tubey" as in "fuzzy," but natural and liquid (especially in triode mode) and not artificial or dry (i.e., VTL will not be mistaken for transistors.).
I concede that VTLs do not have the finesse of low power tube amps such as those from Lamm. If your speakers have low-sensitivity (e.g., Magnepan, Martin-Logan) then high-power VTLs may be your only option.
Importantly, Luke Manley is very helpful if any issues develop. I am quite certain he will keep my 750w amplifiers operating for as long as I operate.
Over the years, Wilson Audio, Martin-Logan and Transparent Cable have often demonstrated their products on VTLs.