I bought an S-993A from China, it was ok for removing switches from one keyboard that I took the switches off, but now I think the hole in the tip has enlarged (you have to kind of spin the wire in the tip to get the heat to transfer after you've sucked most of the solder up - if there's not a lot of solder left holding the pin in to transfer the heat), so now it doesn't work so great. Might be ok with a new tip though.
Usually if I only need to remove one thing, I can't be bothered to plug it in and set it up. Tbh I'd almost forgotten that I bought it, with all the Chinese crap lying around my place!
I was hoping it'd be better, but it's not terrible...