I have one and use it all the time. My favourite veggies to spiralise are raw carrots, sweet potato, beetroot and courgette. Cooked beetroot spiralise nicely too.
Substitute for pasta eg I use sweet potato with a 'spag' bol. But also lovely added to salads. Or simply add to any meal as another way of serving vegetables.
Sometimes I steam, sometimes fry in olive oil and garlic, sometimes roast in the oven. My microwave blew up but I believe they microwave well too.
Fruits like apple and pear spirailse easily and the GC love them like that.
I find ithat really easy to get your 5-a-day this way.
I imagine, that it will come into its own in winter for soups and stews too.
Most spiralisers are easy to use (I have arthritic hands too) and very, very easy to clean afterwards.