I've heard only great things about Ultimate Ears, and am looking at a Super.FI 5 PRO

This guy sells them for $125 which is about $100 off retail


looks legit as far as I can tell
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100% positive feedback and over 100 feedbacks makes it seem fairly legit, but I don't know anything about these particular earphones; you should look around for what other people on eBay are selling them for, usually you want to shoot for 50%-60% of retail when buying from eBay.
Ultimate ears are awesome. With that kind of feedback rating and over 100 feedbacks, its pretty legit.
I've bought, sold, and traded more gear than I care to admit.
I have some of these, they work really well.
Gear: Warmoth Soloist / Hondo Acou. / Ibanez AS73

Hardwire TL-2 / Boss GE-7 / Electro Harmonix Small Stone Nano / Boss DD-3 / MXR Smart Gate / Ibanez TS9 / Unknown Tremolo

Bugera V55 / Home Made Cab w/ Celestion Speakers G12M & G12T