When I first got my kit I had a problem with a dodgy ballast - but since then they have both worked OK! Touch wood, I hope this stays that way!
Overall I am happy with the upgrade.
Here is the reply I received when I enquired about the warranty.
Dear Customer
Thanks for choosing our product, of course we can do resend, exchange or refund to sovle the problem, All of these are based on the policy which we listed on eBay.
As we tested all the kits before we shipped out, so first I want you double confirm which part is defectve,
Check with the Polarity, you may need to reverse the wires (Postive and Ground) to test it , Disable the Day Running Light, exchange each parts to make sure which part is defective. and make sure there is really a defective part.
If you still think there is some problem with it. You have the following options, but option 3 is recommended:
1. Send the WHOLE kit back to us, we will test it again, if there is really a problem we can do exchange or refund! If the problem comes from the products, we will cover all shipping fee, while if there is no problem with the products, you need to pay the shipping fee for shipping back.
2. Send defective part back to us, then pay $25 for shipping fee, so once we receive the defective part, we will send you a new part.
3. Just pay $35 to us, so you don't need to send the defetive part back to us, and once the payment received, we will send you the new part immediately. (That is only for one relay harness or one ballast or one bulb)
I guess if you are happy with the improvement they do provide, you are probably better off just ordering a complete kit based ont he prices given. At least then you have spares!
The suppliers are onto a right winner with the warranty!