I use the TC118 extensively. I play in two bands; a operatic heavy metal band, and a semi-progressive hard rock band.
The output (pure volume wise) is of course amazing. Honestly, and I hope Duke doesn't take offense to this, but that is not at all what's magical about the TC118. I think by now a fair amount of people can take a good 18" driver, stuff it in a properly sized box and make it loud.
The true, eye and ear opening absolute magic is in the tone of this. For my needs, it could not be any more perfect, even compared directly to several flavors of fEarful designs and other cabs with similar tone goals. Since I use a modeler (amp, cabs, FX), I must have a system that is not only transparent in nature, but that takes input well. It's hard for me to explain, really. But very subtle changes in my presets/models are instantly reflected in what I hear. With other cabs, I'd have to do more drastic changes for them to become apparent.
This was even the case when I'd use a traditional per+power setup. Slight EQ or drive changes came through very well.
I'd hate to call them "flat", as that implies a technical term and also a kind of sterile feel. I would not characterize it as sterile. It does have a tone baked in, which is tweakable with the switches and the plugable ports. I personally leave the ports plugged to keep things a bit tighter. If you're just running an amp, or pre+power setup into it, expect it to feel like someone took a blanket off of your old cab - just opened things up and allowed more to come through. Oh, and all the while be freakishly loud.
It feels pretty efficient, but I'm driving it with 800W which will make most things loud. It easily matches output with the guitarists in both of my bands... and can "earthquake" underneath it all and shake the hell out of where ever we are, or slice and dice through the mix. It's truly impressive.
Then, the rest of it all sets in. Mrs. Selta plays violin (has played violin since she was a child, went to Juliard as a kid and so on). A few years ago, we got her an electric violin so she doesn't have to use her really good (and holy-poopie expensive) violin for our bands. At a GTG I put together in 2014, Duke was present and brought along various cabs. The TC118 handled bass and upright bass as well as as everyone here can already talk your head off about. But, never in my mind would I have imagined a bass-oriented cab, especially one with an 18" primary driver, doing violin justice. But believe me when I tell you, it does! Now, that may not sound applicable to us as bass players, but to me, it proved that this cab would faithfully reproduce the full spectrum. It's made me a better player, in that it doesn't give me much room to hide bad technique.
To this day, we both still use the TC118 for electirc + upright bass, cello, keys (Korg M3), violin. And it sounds wonderful at all of those things.
I honestly can't sing praises high enough of the TC line, and the TC118 in particular.
Sorry for babbling. Once I heard the TC118, I was sold on it. I haven't had to think even the slightest about another cab at all since then. I may end up getting a 2nd TC118, or another TC model just to have as a secondary to leave at a rehearsal space or something. But, I in no way see or feel a need or want to change cabs at all at this time.
