I grew up in Courchevel 1850 the top 5 Ski Resort in the world!
in the beginning of the 80's I was 14 years old, was part of the Ski Resort Club, and was doing the mandatory ski racing program...
Then one day I see my close friends sliding down with what look like a large ski were both of their feet were attached together!
The Monoski had arrived to the Alps.
The best use of that equipment is basically like the way I like to use a snowboard, deep fresh powder and spring snow, so your edges grab the snow better, and it is easier to stay standing up. But back then, we were young and had the ability to ski anything, including steeps, like the Couloir in Courch (Courchevel 1850)
One of the amazing thing about the monoski is that you can go straight down in powder in a very steep incline ( we mostly found these outbound right by the slopes so anyone could see us in case we were in trouble) you just lean back with your arms wide open on both side, with taller than usual ski poles, to catch yourself for balance.
Compare to a snowboard, I can tell you that the monoski is way way more stable at high speed, you never have the back of your board trying to jerk you to the side. In powder still going fast, you can lean completely in a dynamic turn position.
I miss my two monoskis, yes I had two, both Rossignol made. One was a 170 the other a 180. I am 165 (5'5)
In 1999 I started getting bored with my monoskis, and gave they to the Salvation Army in Queens N.Y, where I lived at the time.
Now these days I really kick myself for not keeping them, this past Saturday at my local ski resort, we had or Annual Pond Skim, and I can tell you that with a monoski you can get to the other side of the pond every time for sure... I jut have to find myself a used one.
So to answer the question "Monoskis-why bother?" I say yes go for it.