I was just browsing stuff, bored, seeing if there wasn't anything I couldn't live without to put in to my new truck, and this light system showed up in suggested items. I'm so glad it did!I was very wary about it at first. I mean, hey, it's a custom LED system for only $17, and you usually get what you pay for. However, since it's Amazon and I felt I could return it if it just wasn't gonna work out, and after reading the plethora of positive reviews on the product, I took the chance. Even if I didn't get my money back it would break the bank, either.This thing rocks!Wait, let me say that I did go test my truck first, to see if it would kill my battery or if I would always have to unplug the thing every time I turned off my truck, and plug it back in again later, because that would just be lame. It's important to note that this ONLY works on USB power, and that some USB power is simply always on, especially if you have a USB adapter through a cigarette lighter. I tested my USB ports and made sure that they received power only when I opened the door to my vehicle, and that they turned off when I exited the vehicle. And after a few minutes I found out this was true, though the USB stays on for about 30 seconds after turning off the engine or opening the door, but does indeed turn off. This was key, as I want the lights to come on when I open the door and I want them to turn off and not bleed my battery dry.After that, I made the purchase.The only questions left were:1) Could I install it well enough to be hidden but still show enough light, and...2) Would the light system remember the last color I chose or would it reset every time?The item was received quickly and I tested the lights immediately inside the house. Sure enough, after unplugging the lights and plugging them back in, it remembered the color. Sweet!The installation was easy, with ample wiring to get to where the lights needed to go with enough extra distance to route the wires so that they'd be hidden. At least for me. =)I actually used small, black zip ties for three of the lights, as there really wasn't anywhere flat, smooth, and long enough to stick the lights with the adhesive, and I felt trying to use the adhesive backing wouldn't work in the long term. I loosely looped the zip ties into circles around little metal bars under the driver's side dash and under the front seats towards the back, then pushed the stick of lights through the circled ties and pulled the ties tight after lightly positioning them to shine in the correct spots. For the front passenger side, I did have on long flat space low enough that you can't see the underside enough unless you're nearly laying your head on the floorboard, so I used the alcohol pad that came with the light system (very key), let it air dry for a minute, then stuck the lights there firmly for 30 seconds just to be sure a good stick was achieved.These lights, after a day of use, really look fantastic! They turn on when I open the door, look great while driving (I use either a dark blue or dark purple so it's not so bright at night, or distracting).The music feature for the lights to work with seems to only work if you're playing music from your phone, and the mic feature barely seems to do much and is an odd feature anyhow. Most of these extra features don't really interest me.But, again, the fact that as long as your USB ports have power that turns on and off appropriately and you're prepared with some zip ties, this system is an ABSOLUTE STEAL for the money! Super happy I took a chance on these!