If you ding the blades, they're not particularly difficult to re sharpen.
Nip them closed and grind the back face on a fine stone on a bench grinder. Hold them up to the light and remove more material where they're touching until you get contact along the full length and you're back into clean material on the cutting edges.
You can do it on a linisher too but it's easier to manage the contact with the round face of a grinding stone and with it, the heat
I got a pair of the Snap-on one's, they're really good quality but I think they're made by knipex and are cheaper to buy off them.
One bit of advice, if you're going to use them to cut through a piece of 7 core trailer cable, make sure it's the 7 core you're cutting and not the lead of your hot air gun, they don't like cutting through live 3 core flex.