I have heard all of them. IMO Sound lab is the best of them. The Martin Logans always seem bright sounding to me. The Apogees are no longer made, may require expensive service, and some models like Scintilla require very careful amp matching.
If you are thinking of full size speaker models with any of these you really need a big room to get the best from them.
If you are thinking of full size speaker models with any of these you really need a big room to get the best from them.