Hazel...it's worth the investment. . . . you can buy replacement parts for the Felcro ones but in ten years I haven't needed to.Other brands available.......
As my dear late Mother would have said :
" Never trouble trouble, 'til trouble troubles you"
They work fine and I'm sure I'd make them worse by messing about with them.
I'd really recommend investing in a good quality pair, Hazel. Like I said above, we've never had to sharpen ours and we use them a lot! We do oil the blades occasionally and keep them clean, but otherwise we're with Hosta on this one. And his Mum!
I have 2 pairs of Felco ( only because I once lost a pair, then re-found them )
No 2 for everyday stuff and No 8 which I prefer for more delicate stuff like dead heading.
I'd not have any other brand.
Hosta, maybe you just have very strong hands, so don't need to sharpen yours.
Pat, I can do butch when I try.