I bought a Firestone Delux as a small kitchen sharpener since my wife makes food for Farmers Markets and puts her knives in the block blade down which blunts them. I do a bit of butchery once a week using a 12" Victorinox steak knife.
All in all the Firestones does what it says on the can but it is more suited to cooks knifes and flat bladed knives below 12 inch in length. Everything needs a tickle with a steel or carborundum to get really sharp but the Firestone does get the profile right and it is suitable for keen amateurs and chefs if not butchers (I would use a £600+ Dick sharpener if I had the space).
For what it is the Firestone is a better bet than a swanky steel and a lot better than high priced celebrity sharpeners, diamond steels (RUBBISH!!) or cross shaped sharpeners. It measure roughly 8ins x 5ins x 4ins and has suction cup feet to stop it moving around the worktop e.g. it was designed by someone who can cook!
The best feature is that the carborundum wheels are replaceable for about £25 from Scobies in Glasgow so that makes the Firestone a practical option for working kitchens without space or budget for a professional butcher's sharpener