I have a Steinberger Spirit I bought nearly twenty years ago. Mine is the GU type - the ones shaped a bit more like a guitar. It's also one of only two left handers I've ever seen in the UK. It was privately imported waaayyy back when they were being sold by MuiscYo. It was completely counterintuitive in some ways - totally *not* my aesthetic style - but at the time I wanted a guitar I could transport easily in hand luggage, and this hit the spot. There are a lot of travel type guitars that achieve being compact by reducing the scale. The Steinberger has a 'proper' scale (from memory, I think it's more Gibson than Fender), with a full size neck. The size reduction is achieved by the headless design, and the body being significantly smaller. (More so with the paddle ones.) 24 frets was interesting to try (I'm very much a 21 frets or GTFO guy, though being left handed I often have to compromise and accept that ugly little 22nd fret overhang on a Fender type). The headless set up while ,frankly, to my eyes utterly fugly, can't be faulted in terms of ease of tweaking the truss, and it stays in tune, especially in a gig bag, like no other guitar I've ever owned (and I've had some great ones on that score). The hardware is good stuff - particularly impressed with the bridge. The push-in arm works very well, it's stable, returns to pitch beautifully. The little leaver arrangement that renders it a de facto fixed bridge otherwise is clever and also works wonderfully well. All done and said, I can't fault it at all. If Fender made one that just, well, looked a bit more like it came out of the 50s, I'd consider it. It's a cracking guitar that plays like a full-size one but has the overall physical size of a banjo.
That all said, I'm going to be selling it over the next few months. I have too many guitars, want others, and need to sell some stuff to realise both space and the funds for buying them. If I had limitless space and funds, though, I'd probably keep it around. I still think it's ugly, but I really warmed to it as a piece of design, and it is nice to play. The Brompton bicycle of guitars...