I can answer this with first hand experience on both kits. The eBay kit I assume your referring to the K2 kit for ~60.00. I purchased this and got 3/4 of it installed. Back to that in a sec.
I read good reviews on this kit over on
www.8thcivic.com and took a chance and bought the kit. Over all I was impressed when I opened the box. The kit looked OEM and overall the parts seemed good quality. Looking closer I was a bit disappointed. The connector from the wire harness which plug into the bulbs were not good quality. The connectors themselves were a bit flimsy and if I pulled with little effort I could have separated the module and exposed the pins. First thought there was winter corrosion.
I almost repackaged it up and and resold it, but the recent warm days in New England were a gift so I took advantage of them and attempted to install the kit.
As you can tell from my handle my previous vehicle was a WRX STi and on that vehicle I ordered and installed the JDM fog light kit on that. I'm not gonna compare the two, but considering they both required removing the front bumper as well and mounting the lights I have to say the STI was MUCH easier, which also included switching out the bumper beam.
I found with Honda having to wrestle with the bumper and to use a saw to hack out the plastic was terrible. Also if you don't keep the area clean on the blanket your liable to scratch your bumper ! I then attempted to install the wire harness pin in the vehicle inside wire harness and broke the flimsy pin on the fog kit... I couldn't believe it... I knew it was all over at that point. Luckily I was able to pull the broken pinhead out of the vehicle harness.
Now I did that with the ebay kit and just today I received my mail order of the Honda OEM kit. The Honda kit is of much better quality in every piece.
My conclusion is unless your on a tight budget and are good with custom car work I recommend buying the OEM kit and have the dealer install it. The Dealer knows the labor cost in the books. I did this with my block heater and found it well worth while.
Also note if you decide to install either kit yourself... and if you live in a cold weather climate be careful working with the brittle plastic as you will have a good chance in breaking the plastic, especially the stearing colum for the Honda kit.