What's the best skimmer i can get for $200-400?

[spencerC]

i'm just a little bit worried buying used because you can never be 100% sure about anything, and you can't really go back to the person to get it replaced if it doesn't work.

Plus i've heard skimmer technology has improved greatly in the past few years.

I'm not saying these used skimmers you guys have aren't great,
but i hope you can put yourself in my shoes!