I also recently bought from NY brew supply via Amazon as opposed to EBay. I had a mostly positive experience as well. I ordered a 50' copper IC . Delivery was quick and packaged well.
My only problem was the fittings were epoxied onto the ends instead of soldered. I didn't think this would matter at first but after a few boils the discharge side got brittle and cracked as I was attaching the hose (I don't think I was overly forceful or anything). I ended up taking both fittings off striping the epoxy and soldering them on myself.
I emailed them just to let them know of the issue I didn't expect a response really. They responded within minutes of my email explaining that they haven't had that problem before and possibly the epoxy wasn't applied correctly on in the right amount. they then gave me a partial refund which was totally unexpected. It ended up covering what I spent on supplies to fix it (I didn't have any copper soldering supplies).
So though the chiller I ordered had a defect, thier customer service was top notch. Plus they seem to have the best prices I've seen for chillers. I was having a hard time finding the parts for the same price if I wanted to make it myself. Coppertubingsupplies has a kit but their shipping cost makes it more expensive and my local hardware store would have been far more expensive.
Primary: Unnamed Milk Stout
Secondary: First attempt Mead, Raspberry Apfelwein
Keg: Hot Red Head Stawberry wheat, Infamous Imperial IPA