What it says on the label. I'm interested in what other folks want in an amp of any sort that isn't on the market yet (no reason other than a discussion - alas I'm not in a place to make it happen!).
I'm not opposed to valves per se, but equally, I've never been a tube purist. If it sounds good, then it is. I absolutely welcome the idea of an alternative tech that can't be distinguished from tubes, on the basis that that isn't just "reinventing the wheel". It would bring a lot of other benefits - lighter to carry around, more manageable volume, and, well - I don't think tubes are going to be around at an affordable price forever. But the practicality of carting it around and convenience go a long way for me. I've said for a long time I'd welcome a good modeller that instead of offering eleventy million different sounds did one sound really well. I have a big Vox AD120VT. Gorgeous sound, as good as any of what it knocks off, BUT I've only ever used one or two sounds from it. I don't like onboard effects. I use effects less and less nowadays (I'll keep all my old pedals, but really all I want now is a decent, classic od, clean boost, tremolo, and echo/reverb). 99% of what the Vox can do is wasted on me. Fender have in more recent years produced what appeals to me in their Tonemaster series. Of that lineup, the Twin Reverb really appeals - money no object, I'd have one of those already, and be waiting to jump on the Tweed Twin and Tweed Champ versions as they arrive. That's the sweet spot for me.
With that sort of tech here and new models on the way, my thoughts have turned to tiny, on the go practice amps. The killer app for me now would be something the size of the Positive Grid Spark Go, but simpler. Sounds like a Tweed Champ, decent volume (The PGSG does have the right volume level for me), headphone socket, and a 3.5mm line in. The Go sounds great, but it's got a lot of functionality I'd never use. The bigger strike against it is the lack (if I've picked up the spec right) of a 3.5mm line in. I'd like something that could be a hotel room amp sort of thing, but also function as an external speaker for my mp3 player and tablet on the go. Both of these devices do have blutooth, but I vastly prefer to use a 3.5mm cable instead, which makes a very marked difference to battery life.
So that's what I'm waiting for happening in the amp market: a pocket-size, 1 watt Fender Tonemaster Champ with 3.5mm line in and a line out. Given the leaps and bounds in tech since I got my Smokey amp twenty plus years ago (still fun, but not a 'serious' amp, more of an effect than anything), it should surely only be a matter of time?