Yesterday evening I did a three-way comparative test of the Vibrato, Grafton and Vito Yamaha. Quite instructive. I played all three with my usual Yanagisawa mouthpiece and RJS reed.
I started with the Vibrato, or at least I tried to. A couple of problems with sticky pads, which actually seemed to be worse than with traditional leather pads. G#, unsurprisingly, and also low Eb. Once sorted, I played a couple of tunes. It sounded OK, felt mediocre under the fingers. On to the Grafton, it sounded a little brighter, and felt much, much better to play. Although by modern standards the Grafton has fairly mediocre ergonomics, it was still streets ahead of the Vibrato. Then the Vito, which is basically a YAS23. It's battered and scruffy, but it plays great. It was a big improvement on the Grafton, and light years ahead of the Vibrato.
The thing that interested me about the play test comparison was that the big difference between the saxes wasn't down to the sound, it was how they felt to play. The Vibrato was, by a long way, the least pleasant to play, with its squishy action, bendy keys and poor feel under the fingertips. The Grafton also has a moderately imprecise feel, but was much better than the Vibrato. The Vito was a delight to play in comparison. Even though it was made as a student sax, and was the cheapest of the three to buy, it played very well, with comfortable touch pieces under the fingers and a nice precise action. It was closer to my Yanagisawa than it was to the Grafton.
So, the Vibrato does just about make it as a saxophone, so it's more than a toy. I was able to play a tune on it and sound OK. However, in my subjective opinion, it didn't look anything like as cool as the Grafton, and it was nowhere near as good to play as the Vito. The only use case I can think of in which I'd select the Vibrato over either of the other two would be playing outdoors in the rain.