Which trailtech lights are you using? Are they the 4" or mr11. I never been of a fan of trailtechs products anyways. Especially when they knock off other people's products. I've seen a lot of their stuff fail. They make a decent kickstand though.
Most of the cheap hid ebay upgrade kits my friends and I have used have had mixed results. We've had bulbs and ballast go bad after only having them for a week. Most of the failures were after a couple months. These were on street driven cars. Take the same parts and put them into a offroad light that is going to see major vibration and guess what's going to happen. To build a hid light and sell it at $150 let alone $75 you have to figure they are using the cheapest components they can find, which like most things made in China equals poor quality. Harbor Freight sells this hid for $120 harbor freight and from what I've read on the off-road forums there have be a lot of problems with it. It actually looks like the Kragen light and this light use the same rear housings. I bet you this is the same light with a different front grill and lens. In fact it looks like Lazar Star also uses the same light. Lazar star. Again it looks like they just changed the front lens and grill and are charging a lot more money. At any rate like you said replacement bulbs and ballast for these lights are cheap and can be found for about $100. It's just a matter of how often you are going to have to replace them. If the components do end up lasting for more than a year these lights are a pretty good deal. Only time will tell.