Hey tuckia08,
Remember, for certain people not having meters would be a deal breaker! That's why the meters are an option. I ordered my #16 without meters, because I too I'm not attracted to them. The S5.5 does not have the meters, just a half inch attractive engraved faceplate.
I do not experience that the S5.5 sounds like its big brother #16. It has the virtues of the other Coda amplifiers and then adds on a sense of overall aliveness/transient speed and the best top end of any solid state amplifier I have heard in my system. It sounds different then either the #8 or #16, which are both great in their own right, and is turning out to possibly be my favorite of all the Coda amplifiers.
Of the list of amplifiers you mention in your post, which are the "cream of the crop" in solid state Class A amplifiers, I have heard them and still would argue that the S5.5 competes with them easily for far less money.
Teajay