I think trace Elliot lives from its great reputation from +20 years ago.
When I started with bass playing, there was not so much to choose from as novadays. And trace Elliot was known as bulletproof bass-sound heaven.
I went with it, too. Friend of mine bought a MK-V GP11 4x10 combo and removed the head from it to run it with his own 350SMX head. So I bought the combo head from him. Just 150 Watts, but the sound is sweeeeeeeeeet.
I always say, TE is not made for everyone, I met a lot of bassists that wouldn't like the TE sound. In fact, TE heads do only sound right to me with the pre-amp shaping active. That's more or less a scoop function, but I have to admit, the best I ever heard.
I will never sell this head, but I would not buy any TE again. Have one, love it, but it's a bit of gone glamour with TE. Their products disappear, their marketing is nihil and the heads are outdated.
In the local markets you see people still rely on the good name of TE and ask prices for products that are totally surreal.
Oh, I never heard or used their Valve stuff. Would like to, btw. The valve pre-amp in the SMX350 of my friend back in the days wasn't utterly convincing but their all-tube heads seem to be killer