I've got cheap knives that all need sharpening and I'm not fussed about removing metal, I'll just replace the knives if need be. The only sharpener I have is one of these and frankly, I don't feel safe using it. I usually wear kitchen gloves to hold it 
I don't think I'd be very happy using a regular long steel either, I value my fingers too much. And I don't think they're for sharpening anyway, more like for straightening blades. I did watch an interesting video of some guy using a diamond stone which looks very safe to me as it's slow and smooth with no risk, but I don't think they'll be cheap. https://www.youtube.com/watch?v=VIN6TGPC5fk
Is there a cheapish machine, manual or electric, I can stick knives into that would do a respectable job?


I don't think I'd be very happy using a regular long steel either, I value my fingers too much. And I don't think they're for sharpening anyway, more like for straightening blades. I did watch an interesting video of some guy using a diamond stone which looks very safe to me as it's slow and smooth with no risk, but I don't think they'll be cheap. https://www.youtube.com/watch?v=VIN6TGPC5fk
Is there a cheapish machine, manual or electric, I can stick knives into that would do a respectable job?