We got teen dd one last Christmas and she loves it. It gets used a lot and when her friends are over they all love it.
We used to make hot chocolate by heating milk and melting actual chocolate (or those cubes on sticks) but the velevtizer is FAR better.
Dh and I will often indulge in one too even though we are usually more coffee drinkers. He loves the flavoured one, chilli, ginger, mint so we buy a selection box for him, dd loves the white chocolate and the salted caramel so she gets boxes of them and I like the classic or dark.
It's a total doddle to clean, we've never had an issue with it, as soon as we're finished using it, we take the whisk out and swish it in hot soapy water, then rinse it. We swirl hot soapy water around the chamber and dry it off. We've never once had streaks nor had to scrub it etc but we really only use the hot chocolat sachets and have never used powder. I have read that this can clump in it a bit.
I though it might have been a bit of a fad but a year later it's still going strong. We got the copper one and we have it beside the kettle and coffee machine and it looks great.
If ours broke tomorrow we would replace it.